martinacastro - 2:05 am on Jan 3, 2012 (gmt 0)
you can test if your domain is penalized searching for specific strings of your homepage. If your content is unique it must appear in the first page, otherwise your site is penalized.
I recommend you to read the thread of Panda as tester told you.
About the reconsiderations, what kind of messages you recieve? No manual penalization?