Ok well seeing as i get a lot of people asking about userbars..I have now decided to make a thread just for you...
I hope this helps..
OK well firstly - Userbars are easier to create in Photoshop..the tools i use to make mine are far easier to find than in Gimp.
Secondly - People who want make userbars but don't know how.. here are some tutorials i found helpful.. (Staff - sorry for posting links feel free to delete them)
Photoshop userbar tutorial
If you need any more info then PM me.