Okay, I'll go first:
My only current marine tank is a 65g AGA tank in the living room, along with a (temporary) 50g sump in the basement. This tank has 2x250w 14k EVC w/electronic EVC ballasts on it and will house mostly SPS, along with perhaps some LPS and Zoanthids in the lower recesses. Fish load will be light, though I haven't quite decided what is going in it yet (other than a Venusta angel once it's all set up...).
I'm currently building a 20'x13' fish room in the basement that will be dedicated mostly to coral propagation. I also plan on breeding Banggai cardinals again (I've done it in the past, though this will be on a larger scale).
Coral tanks will consist of 6x45g tanks hooked up to approximately 150/300g (will add sumps as I go) worth of sump space, a 7'x2'x1' fiberglass tub tank, a 32g clam tank, in addition to a rack of 20g tanks for breeding the cardinals and possiblhy holding other fish.
My past coral keeping includes just about everything: Acropora, Montipora, various leathers, Blastomussa, Acanthastrea (lordhowensis and echinata), various Xenia species, Discosoma mushroom, Ricordea (florida and yuma), assorted Zoanthids and Palythoa, Euphyllia....and there's lots more I'm sure I'm forgetting. I've successfully grown and fragged pretty much all of them.
In addition, I've had success propagating Banggai cardinals, lettuce nudibranchs (Elysia sp.), Cerith and Trochus snails and peppermint shrimp. These will be a side hobby once the fish room is up and running.
For freshwater, I also currently have a 38g tank with my pair of albino oscars along with a huge Snow King pleco. There's a 120g tank with these guys names on it waiting to be set up.
So...whatcha got?