This was taken yesterday from my front yard looking almost straight up. There was a vigorous spin and it appeared to be sucking all the low clouds around it. It was clearly a rotating updraft, but I'm not sure if it was a mesocyclone or what?. According to http://www.nbc-2.com/articles/readarticle.asp?articleid=7665&z=3&p= there was a funnel reported nearby from the same storm. While I was watching it it really tightened up and increased it's spinning.
It definately didn't look like a funnel to me at that point though.

There are several more full size pics from the series here:
http://bobbutts.mine.nu/images/

edit: reduced image size