ponyboy96 - 4:02 pm on Jul 9, 2010 (gmt 0) [edited by: Robert_Charlton at 7:03 pm (utc) on Jul 9, 2010]
Just a couple of quick checks and questions for you:
1. Have you viewed your robots.txt file? Did it change?
2. What about your meta robots file? Is there a no-index?
3. When you redesigned the site, did the URLs change?
4. Is your site still listed in Yahoo? Bing?
I've been around the block on these things as well and been doing SEO for some very big companies for some time. It has been my experience when there is a drop, to try and eliminate the simple things first. I cannot see the changes that you made dropping you out of the rankings like that. There has to be more to it.
[edited by: Robert_Charlton at 7:03 pm (utc) on Jul 9, 2010]