Not sure John, don't have Win 7, don't expect to anytime soon.
Your skins are built solid for Vista so to make them WIn 7 worthy all you need to do is..
1. Make the start button maximum 50 pixels wide.
2. Make the Vista logoff buttons no larger than 53 pixels wide or it will get cut off. Only 1 button is used instead of 2 so it needs the shutdown glyph/ text.
3. The taskbar buttons would need to have the part where the icon goes in your design removed.
** might require making the logoff arrow as a glyph but that depends on the design. If done the usual way like in Vista it should be OK.
Everything else will work fine as not much changes from Vista to Win 7.