Just a few sites with lots and lots of reference pictures of Go-Bots, Transformers (from G1 to today) and other transforming robots:
http://www.tfu.info/ <-- Includes a guide to identify your Transformer or Go-Bot by color and alternate mode, as well as ID'ing micromasters, minicons, Nebulans (Targetmaster / Headmaster / Powermasters) and Pretender Shells
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Its just kinda cool, if nothing else, to check out all the ones I had or still have in some cases.