Site got Slapped??

Hey guys, I finally got my first site to rank, but about a day later it's ranking completely fell to the deserted back pages. Everything on my site was optimized, without keyword stuffing. Does anyone know what attribute on my pr websites could have set off googles alarm? Was it too similar of content, or the backlinks on the pr websites, or maybe one of the sites was slapped on google? Help is very appreciated!

See original post by Christopher Hemingsworth