The guy behind Cydia, Jay Freeman (aka Saurik) has released an APT update which has significantly improved the rather slow, and painful loading times in Cydia. Cache Generator has also been optimized so that Cydia doesn't take an hour reloading. This new update is said to drop the loading times from 22 seconds to just 2.2 seconds (tested on iPhone 3GS), 10x improvement.
I have got loads of emails and queries via comments on the posts here and here where many of you have been asking on how to fix 1604, 1603, 1602, 1601, 1600 error in iTunes during firmware restore. This error is occurred when you are trying to restore your jailbroken custom iPhone 3.1.3 .ipsw file which you cooked using either PwnageTool or sn0wbreeze.
This is a guide geared towards iPhone users with Mac OS X. The steps are exactly same as they are on a Windows system. You can find the Windows version of the guide here.