And now I'm back to #5 in Google.com (USA). I use a variety of keyword ranking tools to determine my current position, as Google.com will reflect different results depending on where you are searching from. I found this out the hard way once when I was vacationing in Vegas and thought I had dropped in the SERPS.

That's interesting that you say my incoming links have dropped. I actually dropped from about 700 to about 450 in yahoo (link:http://www.ustillup.com), but in my Google webmaster tools see more I'm actually showing that I went up. I don't know who to believe.