For old Amiga games i recommend the newsgroup alt.binaries.warez.amiga (yes i know some new software gets posted there aswell but the amount of old Amiga games what gets posting on there is incredible)
For old platform roms i use and recommend P2P and IRC places, no ads, no popus, just roms galore.
Lemon64 is the best website for C64 games, also it mentions Amiga :-)
