HTC Desire low on internal storage, I'm clueless -- Any help?
One problem I've noticed is the (at least in Android Froyo), the stock Web browser caches to the phone storage. The browser cache can quickly take up 20+ MB and therefore use up free internal storage. 

I've moved to using an alternate browser (Dolphin) and set it to cache to the SD card. This has removed my "low internal storage" limits; my free internal storage space now stays much more consistent except when installing new applications.