Like a lot of people, I'd prefer to have have a hard copy of my Xbox Live Arcade games, so I always buy those XBLA compilation discs whenever I see them on the cheap.
I'd like to get a list started of what's available. So far these are all the compilations I know of. Am I missing anything here? Left out Sonic's Mega Collection since the games on there are a little different than the XBLA versions:
Hasbro Family Game Night - Scrabble, Battleship, Connect 4, Yahtzee, Boggle, Sorry & Sorry Sliders
Konami Classics Vol. 1 - Castlevania SOTN, Frogger, Super Contra
Konami Classics Vol. 2 - Contra, Rush'N Attack, Track & Field
Namco Museum Virtual Collection - Pac-Man CE, Galaga Legions, Mr. Driller Online, Dig Dug, New Rally-X, Pac-Man, Ms. Pac-Man, Xevious, Galaga
PopCap Arcade Vol. 1 - Bejeweled 2, Astro Pop, Feeding Frenzy, Zuma
PopCap Arcade Vol. 2 - Peggle, Feeding Frenzy 2, Heavy Weapon
Qubed - Rez, Lumines Live, E4
Watchmen: The End is Nigh - Part 1 & 2
Xbox Arcade Play Wireless Controller Gaming Pack disc - Geometry Wars 2, Lumines Live, Bomberman Live
Xbox Live Arcade Compilation Disc - Pac-Man C.E., Uno, Boom Boom Rocket, Luxor 2, Feeding Frenzy
Xbox Live Arcade Unplugged - Geometry Wars, Wik, Hardwood Backgammon, Outpost Kaloki X, Texas Hold 'EM