Sure thing - at the top of the General BlackBerry Discussion Forum -
http://www.blackberryforums.com/forumdisplay.php?f=10 - there are some Sticky Threads which are very good. This thread -
http://www.blackberryforums.com/showthread.php?t=1871 - has a good discussion on "downgrading" which is the same as reloading the OS.
Good luck!