Well i'm in the same boat as urself partner. The best way would be to join many forums and get help, i don't know anywhere with comprehensive collection of everything right now.
Which formats are you wanting to know about? I mean all formats that have been around for ages are still used now, such as XviD, DivX, MPEG, MKV. Or are you referring to the seemingly endless variations of "VCD" (such as KVCD, SVCD, XVCD, MVCD etc). If you post some information on what exactly you want to know about which format, or a little be more information I'm sure some people can help you out further
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