pteam - 11:40 pm on Nov 23, 2012 (gmt 0)
It happened to my site on Oct 30th or Oct 31st. I guess it was a sick halloween joke! :(
I am starting to see some results after I removed the internal links I added.
After the -950 penalty. I am now seeing alot of results that have moved up +100 spots, and some results that have moved up +800 spots to around spot #150. I have a few results that are around #99 and even a couple results that are back to the first page already!
Honestly the biggest problem with your penalty is figuring out what caused your penalty. Once you know that you have a huge chance of solving it.