I thought I posted this before, but since I can't find that post I probably didn't.
I noticed a lot of people complaining about the cache taking too much space on c:, it's very easy to change the cache to e:.
Download the 101F8557.txt file and place it in C:\Private\10202be9\
Reboot your phone and now your web browsers cache will be in e:\system\cache
Remember to delete the cache files in c:\system\cache to free up space.
http://www.filefactory.com/file/ah443d4/n/101F8557_txt