GBAGI is an AGI interpreter for the Game Boy Advance. It’ll let you play just about all of those classic games from the glory days of Sierra On-Line.
Unfortunately the interpreter uses the AGI data from the MS-DOS EGA versions and not the vastly-superior Apple IIGS ports 🙂
If you don’t have your old game disks lying around, I’m sure your favorite peer to peer network can hook you up. If not, try browsing the forums at The Underdogs.
On a related note, AGD Interactive is a small group of anonymous programmers who have dedicated themselves to remaking Sierra’s golden oldies with updated graphics, music, and plotlines – for no money whatsoever. They’ve already released sexed-up versions of Kings Quest 1 and 2, and right now they’re working on Quest for Glory 2.