I was very disappointed that Blaster was pretty much unplayable due to slowdown in Midway Arcade Treasures. It sent me back to MAME pretty quickly.
I agree with all the recommendations so far. Here are some others that haven't been mentioned yet:
Intellivision Lives! - It's not a perfect as it's missing licensed stuff like TRON and AD&D as well as arcade ports but there's still plenty of cool games with added rumble, videos, and prototype games.
Sega Classics Collection - It's all remakes of old Sega games. Some of the remakes suck but it's worth it for Fantasy Zone and Virtua Racing alone.
Plus there's all the Sega Ages stuff left in Japan, some of which are remakes, some are direct emulation. Monster World Collection looks excellent.
Konami Classic Series: Arcade Hits on DS is pretty cool for playing some portable Time Pilot or Contra among others.

