Jay Freeman (saurik) has been working heard (haven't we all) on what he calls a “full package index” which is essentially a centralized database of Cydia packages. He just released a major update to Cydia with one new feature called "manage account". This feature allows you to keep record of Cydia Store installed packages and purchased apps.
This tweak to the Cydia store gives you an easy and quick way to reinstall your apps, tweaks, and themes through Cydia after a restore. There are some glitches if you purchased your package through RockYourPhone, you need to link the two accounts. Cydia uses only Amazon and PayPal for payment authorization, you will have to create another account (outside of Facebook or Google accounts) for payment.
Maybe Apple can learn a think or two from these store enhancements...be sure to consider a paypal donation for saurik's efforts with Cydia!
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