I suppose it's different on the go with a laptop, but boot speed would never be a factor for me. Sure, if one OS booted in 1 second, while mine booted in 2 minutes, I'd probably change, but if that fast OS were as crappy as a virus-laden WinME, I'm not going to change.

Which is why I am only using WinXP on my laptop, my other Windows machines are still running Win2K.
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Remind me to change my signature to something more interesting someday