A bunch of news sites posted stuff about Retrobooster after its first demo release. Thanks for spreading the word, everyone.

Rock, Paper, Shotgun
BeefJack
GamersHell
Indie Retro News
Blue’s News
Linux Game Cast
True PC Gaming
Instant Idiocy
Nivel Oculto
Space Game Junkie
PixelProspector

GamersHell was kind enough to mirror the demo downloads. You can find their download links on the downloads page.

Update (December 3):
RootGamer
Linux Gaming News
IndieGames
Respavvn
Indie Kings
IndieGameMagazine