I had about 8 sites all using the same template allbeit different content, colours,images etc which i purchased from someone on here. They were ranking fine with pr and a few on page 1 of google then about a month or so ago i noticed one had dropped down the rankings. I made some changes to content then requested a reinclusion. It then was de-indexed (definately not in google) and all my other templates like that one (on same Ip reseller) also got de-indexed. One thing was that i moved hosts but the sites were ok after that.
Im not sure if i was contravening google TOS or why they were booted off? I have no idea how to get them back to where they were either.
I looked in copyscape and saw some dupe content but wasn't sure if a few lines would affect?.
If anyone would like to help resolve the investigation please pm and i'll give examples.