For SXSW Interactive 2009, I was fortunate to be on the Designing Our Way Through Web Forms panel with Kimberly Blessing from Comcast Interactive Media and Eric Ellis from Bank of America.
We covered a lot of ground in the panel. three mini-presentations and a q+a. My main contribution to the panel was covered in Web Form Elements (presentation): a brief look at how CSS and browsers display form controls.
After assemblig a resouce of 3,500 screengrabs, would you be shocked if I told you that there isn't consistency in this area?
For access to the resource, check out WebFormElements.com, which will take you to my flickr collection of all the images.