A rather cool screen saver

[Drift]

Desktop Earth, I love it and its real timeish too

http://codefromthe70s.org/desktopearth.aspx

[drinksoptional]

will it slow the computer down

[Drift]

Shouldnt do, Ive got a 50meg connection and quite a good set up, though you can set it to update at anywhere between 1 minute and 15 minute intervals, so it wont affect your bandwidth, will be like your email client checking for emails or a web page refreshing, so no big usage really.