I synced my bookmarks through iTunes (iPhones Safari with PC IE). I want to delete bookmarks now from the iPhone that I don't need cluttering up the iPhone, but want to keep on the computer. How do I keep the bookmarks I delete from the iPhone from being added back in each time I sync up? Thanks.

You can export your IE favorites and then import it into Safari (install it on your PC). Once imported, remove the bookmarks that you don't want on your iPhone and then go back to iTunes > Info tab and make sure the option to sync with Safari is checked.