Incidentally, I finished several other games this week that I'd been playing for awhile. All three are recommended. In descending order of recommendedness:

Elite Beat Agents
Nintendo DS

Beat game on the DS! You have to tap targets on the touch screen in rhythm with the music. It's lots of fun. And, unlike DDR, it has a story: You are a squad of special agents working for a secret government agency. Your boss, Commander Khan, looks for people who are having trouble with their everyday lives, then sends you out to... sing and dance for them... for encouragement. As you do your song on the bottom screen, the story unfolds on the top with comic-book-style art. It's hilarious and awesome.

(Technically I only beat the "Cruisin'" difficulty level, so I haven't really "completed" the game, but I've seen the whole story.)

Advance Wars Dual Strike
Nintendo DS

I didn't really expect to like turn-based strategy much, but this game was pretty fun. Apparently I clocked over 31 hours on it, though not all at once. This is a great game to play one map a day before bed or something.

I'm now addicted to a bit of music from this game, too. There's a track which plays whenever you use your "tag power"... This power charges up as you take and deal damage, so it often becomes available right as you're getting pounded. When you use it, you get to take two turns consecutively and get other advantages depending on which commanding officers you are using. Two consecutive turns in a turn-based strategy game is usually devastating for the opponent, since they have a tendency to position troops exactly one space out-of-range of your most powerful attacks. So, when you use your tag power, it's a happy, happy moment. And now I have associated the tag power music with this feeling. Heh.

Rayman Raving Rabbids
Nintendo Wii

This is a party game, but you have to play through all the mini-games in single-player before you can play them multiplayer. Which is stupid. But I did it. The games themselves are actually pretty fun (much better than Super Monkey Ball), and the setting is hilarious. I wouldn't be able to describe it adequately in words; look at the web site.