My fav's are already listed, Amber's Jedi Meditation chamber (The best and first Jedi costuming site I found in 1999 now hosted by Rebel Legion) and Padawan's Guide. Amber's is now legacy....good reference but no longer updated. Maggie constantly updates Padawan's Guide.
I like Thomas Spanos's site (he's the Clone Emperor and was in that costume as well as Prince Xizor at CIII). He's a fantastic costumer and prop maker whose photos of events I greatly enjoy as well. www.paralada.org/Estonia_self/Estonia_htm/Estonia.html