It's not only for rooted phones. I've used it and it's pretty sweet, but there is currently no widget support in Preview 1. Hopefully he adds that when Preview 2 is released, because currently the customization options are endless. I've seen some awesome themes created for it.
It's possible that the dev took it out of the market in anticipation of releasing Preview 2. I hope this is the case, because it's really fun to play around with and has a ton of potential.
EDIT: Checked his website and it seems the next version, Preview 2, is coming out shortly, so that's probably the reason you can't find Preview 1 on the Market right now.
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