Ok, first of all you can't convert anything to better quality, than your source file is. If you have a "decent" quality .avi DVDRip, then whatever you convert to will at most be the same (read: slightly worse) quality. note: same is possible, but takes A LOT of work.

Also one thing to use is bitzi lookup. Plenty of that mentioned on the forums. Second: Limewire has a keyword filter, so if you saw it was CP just from the file name, then there was probably some word(s) that you could add to this filter.