Heroscape - Though not as much as I used to and for almost the past two years until recently I was heavy into designing/testing/playing the C3G Superhero Scape customs. We've got 150 or so comic customs designed and tested and high quality PDF cards for printing. I got burnt out of that due to many, many, many hours involved. Though my daughters still love it and we play once in a while as does my nephew and brother in-law.
I dig Summoner Wars (and will play some tonight with my 15 year-old nephew), but he's the only one that I play that with, at least until I get my 8 year-old twin daughters into it. I wish I could play more, but I'm sure I will in time.
I've been in a Strat-O-Matic Hockey league since '96. They make cards for each NHL player in the league and come out with new cards for the previous real season players/stats every summer. We play all 82 games of a season and then playoffs. Each game takes 45 min to 1 hour, so that eats up some of my gaming time.
I've gotten into Dominion over the past couple months and really like it a lot. I've got the first set and Prosperity, but haven't tried Prosperity yet. One of the things I like about it is that is easy enough for my daughters to play and my wife even tried it (major accomplishment as she's not really a gamer, though she loves hockey and football, so there's the trade-off ). My nephew also really likes it as well.
I just got Thunderstone Dragonspire to be my core set for now. I haven't tried it yet though and will likely play it with my nephew and eventually get my daughters into it. I know people compare it to Dominion either favorably or not, but I'm fine with that and the different theme and enough differences from my research that I think it will be a game I will enjoy.
I just got Lord of the Rings - The Card Game by Fantasy Flight Games. It's one of their Living Card Games they have out and my first one of those. The cool thing about this game is that you can play it solo against the game or co-op. There are 4 spheres (like factions) to choose from: Spirit, Lore, Tactics and Leadership. Each sphere came with 3 Heroes (Legolas, Aragorn, Gimli, etc. ) some allies (Gandalf, Faramir, etc.) and some Event and Attachment cards. You have three scenarios in the Core Set and each has it's own set up for the enemy cards that have enemies to battle, locations to explore and treachery cards to mess you up. Each sphere plays differently and compliments the other when playing co-op. One is better at gaining resources, one is better at questing, one is better better at fighting and one is better at preservation (healing). I've played several solo games and tried the Leadership, Tactics and Spirit sphere so far and only beat the first scenario with my last game and that was about the 3rd try with the Spirit sphere. That was quite fun. In a way, it has some elements that are similar to Summoner Wars in that you need to gain resource tokens to pay for cards, kind of like magic is for SW. But you don't gain resources from destroying opponents or building magic, you gain some each round or from actions on cards and you have to decide when to put a card/s into play and when to save it. But other than that, it's different in having to get through locations by questing so you can get progress tokens on the quest card to advance to the next quest card. There are a lot of other different neat things about this game and I am really loving it and can't wait for the Adventure Packs to come out.