We're seeing a slight usability issue with Team System Web Access. When submitting a new Work Item Type (e.g. Task) the user is given a new, smaller, browser pop-up with the template form. This is fine, but if you have drop down fields on the right hand side of the new window, which contain long string values (e.g. "This is a really long string value that we have in our drop down list"); the user is not able to get the scroll bar as it's off the screen.
The solution is to simply expand the pop-up window so you can scroll the drop down list - though we get user calls on this all the time. This problem happens in Mozilla as well. We're using 1024 / 678 pixels.