I have WM 6.1 and it runs good. I like the threaded text messaging and I see an improvement in overall memory management.
I have tried the latest DCD and no2chem releases, but I personally like vetvito's the most, which is what I am currently running. It just seemed to fit my needs better as he offered a completely stripped down version, so that I could install my own stuff.
http://forum.ppcgeeks.com/showthread.php?t=18836
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