
Activision Anthology for PS2 and PSP (and GBA I think) is one of the best classic collections out there. It even rivals the PSOne Namco Museums! Not only do you have a great selection of games, most of which are actually really good, but you also have scanned copies of all the instruction booklets, high score patches, and even TV commercials you can unlock! I also liked the 80's music they played in the background (80's music is one of my guilty pleasures).
One funny thing to note about the PS2 version is that is has the 2600 port of Capcom's Commando! It even has the copyright info on the instructions and everything. I have a feeling that Capcom didn't know they were going to put it on the collection. I guess Activision published it back then.
My favorite 2600 game from Activision was Pressure Cooker. Have you tried it? It's actually pretty complicated for a 2600 game. --Cary