check out the Cyder application from iphoneapps.ru made by a guy from their team. Works ONLY on windows. There is no home website, but the thing is posted on a lot of iphone and ipod forums, such as

Cyder | Cydia App Manager for Windows | MyTriniPhone.com

THIS THING IS GREAT!!!!!!!!!!!!!!!!!

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JB 16 GB iPhone 3G 3.1.3, Windows 7 Home Premium 64-bit
No Installer, Icy, Kryptes, RockYourPhone, they're full of errors.....
Cydia ONLY!!!! (and, of course, some Appstore....)