Just a heads up in case you weren't aware, the latest version of Nintex Forms 2010 has been released. It's added quite a few welcome features, bug features etc and two leapt out at me straight away.
Default a People Picker field to the current user. Woo!
Query String Parameter. You can now default a field to a parameter passed from a query string. Woo & Hoo!
More are listed in the link below but I've yet to look at them in any depth.
http://nintexdownload.com/sl/supportfiles/NF2010_version_history.pdf
Other highlights for me...
People picker rebuilt. You just type in the box and matches appear.
Form Variables.
Form Version control.
Any experiences you have with the new features let me know!
STH