Highly recommended Retro download sites
The best download/torrent sites if you are after anything retro.
Underground Gamer
If you are looking for any retro file collections this is the best place to start.
BitGamer
Sister site of Underground Gamer, this is devoted to the newer systems out there.
Pleasuredome
Another great site for retro file collections, focussing mainly on MAME and TOSEC sets.
Planet emulation
French emulation site dedicated to the hosting of most known retro games. If you are after a game for any retro system take a look here. They host TOSEC sets for most consoles, home computer systems and arcade game emulators.
Old School Retro sites
If you are looking for a nostalgia trip check these out.
PlopBox
This is a browser based retro music player. The site has a ton of songs available to queue up and play including some classic Amiga game and demo scene mods, and some of the most famous C64 SID tunes.
Demo Scene Sites
Sites dedicated to the Amiga demo scene
Retro-Remakes
Demo Scene Project dedicated to converting Amiga Demo Productions into Win32 native executable files, so you can run them on your PC without emulation.