I'm not sure if this was posted anywhere, but I'm curious to find out how many tanks you all have and what's living in them. 

I have a 60 gallon with 1 fantail, 1 Red Ryukin and 1 Sakura Red/White Ryukin (who looks just like my avatar)

I also have a 5 gallon (totally cycled! Hip Hip Hooray) with 8 Neon Tetras, 6 GloFish and 3 Peppered Cory Cats. It may seem alike a lot of fish in the tank, but they all really have a ton of room to swim around in (they're all very small, under 1 inch). I am going to be getting another tank to move the GloFish into and maybe get a few more types of Dannios.

and a 10 gallon QT/Hospital Tank

Ahem...I have 11 tanks...BUT not all are in use at the moment!!LOL!
Of course that doesn't count the baby fry in the dishpan
Anyway 11 is a nicely rounded number dontcha think?
*sigh ok here goes...remember you asked!!
10 gallon....1 egg fish
10 gallon...EMPTY
14 gallon...EMPTY
16 gallon bow front...EMPTY
15 gallon... 2 small comets, keeping it cycled for when I move the babies to it.
20 gallon....EMPTY at the moment but will cycle soon as the babies will need it as they grow.
29 gallon....tropical community tank, 1 gourami 10 zebra danios 2 clown loaches, a catfish and pleco.
30 gallon....2 Ryukins
55 gallon....6 orandas
75 gallon...commons, comets and a shubunkin
90 gallon...just bought so empty...plan to fill it with more exotic goldfish
1 250 gallon pond...EMPTY will fill in spring
1 60 gallon barrel pond set..EMPTY will fill in the spring
Oh gosh I forgot to add the 4 betta bowls...all with 1 male betta in them!

Wow Minde youre the champion

We are into fish keeping since March 2010.. by now we have got

150 l with 5 Comet Goldfish
160 l tropical community with Platys, Guppys, plenty of their babies, 3 Bristlenoses and 16 of their babies, 2 Corydora Stebai
20l community with Barbarossa ( Siamese Fighter), 6 Rasboras and 2 Cory Panda
34 l community with 3 yoyo loaches, 10 Neon Tetras and 6 Glowlight Tetras
3 bowls about 6 l each with Siamese Fighters

LOL! Teetsy!!  Thank you at least I'm grand Mistress of something!
well, let's see I have 2 tanks in the living room...the 55 gallon and the 29 gallon.
The 75 gallon is in the basement as well the 90 gallon when I get it.
In my office I have the 10 gallon with the eggfish and the 30 gallon with the ryukins and the 15 gallon.
The baby fry in the dishpan are in the basement.
I have 2 betta bowls in the kitchen, one in the hallway and one in my office hanging in the book shelf until xmas decorations are put away, then he hangs in the living room unless we get company then I put him in one of the  guest rooms for good luck!

No, the bettas are in betta bowls just  sitting around.
I've never had one of these hanging betta things.
They look small.
I like to keep my bettas in at least a galon of water or so.

One 90 litre tank with one comet in there, soon to have a little common joining her.

One 22 litre tank which currently has the common but will be moving out very soon, then having a male betta in there

It's enough for me For now 

Lol, I have two and a half tank

317 L (83 gal) with all my goldies: 4 fantails, an oranda, pom pom, two moors, two pearl scales and a gibbiceps (kind of like a pleco) '
30 L (8 gal) with my fighting fish, Bruce Willis (I'll buy him a 15 L baby biorb later)
and  the half tank is a 100 L community tank we keep at my parents' place (Meaning that I usually refer to it as my mom's ) containing two big, fat fantails (a red one and a tancho), a three-spot gourami, three mollies, two albino corys and three bristlenoses.

I've been drooling over a 500L second hand setup online that's incredibly cheap Intend to move my gibbiceps there, since he'll grow to be 50cm long, and stock it with some Oscars
Also looking forward to a juicy 200-250L to stock with more goldies

We have one 60 gallon with Spot, Stripe, Sunshine, and Izzy (comets and shubunkins), and a 38 gallon sitting empty (we moved them to a bigger home).  My husband wants to set up the smaller tank for an oranda or two (and, truth be told, so do I), but I don't think we'll have time for two tanks until the baby is a bit older.  It's a pity- the pet store had a chocolate and blue oranda for sale a few weeks ago, and lots of lovely redcaps as well.
If I had the money and time, I would love a whole room of tanks and little "fish highways" of tubes connecting them.  I'd decorate each tank in a different theme, too.  Fun!!

I have:

A 2 gallon bowl home of a crowntail betta
A 10 gallon tank home of my 2 fantail goldfish
A 50 gallon tank future home of my 2 fantails, a mystery snail and 3 unknown goldfish.
A 2 gallon bowl future home of 2 ghost shrimp

This list does not include hospital tanks.

Wow I am astounded! Wouldn't it be awesome to have a tank large enough that you could dive in to decorate and clean and swim with the fishies  they would give great kisses and try to help with the chores I bet! They'd probably also uproot as many plants as you could place, would be a funny frustrating game though 

How excitingg!!! Minde, what kind of plecos are they??

I don't think I want to swim in my fish pee and poop.

Ok, Creamkiller and we expect pictures!!!

I'd be worried about introducing some dirt/harmful chemicals into the tank. And I'm pretty sure it would be a horrible pain to maintain something like that! xD

By the way, yesterday we tried to connect two hoses so that we could drain the water out of the tank directly into the bathroom, but... it was tight >> I could barely reach to clean the whole bottom, so I think I'll stick to the buckets until I'll get a proper siphon with pump

My big investments for them fish will be that water changer, an aluminum stand for the tank (just for safety) and a 15L biorb for Bruce!
One question though, how do you fill the water back in the tank? Directly from the tap, there won't be any water conditioner! :C