Script Summary: This puts the Subforums back on the top of thread view, instead of at the bottom.
EDIT: Fixed 3/18/11 Facepunch update putting it back on bottom.
A very lightweight script ( ~4 lines long, not including brackets ) that will put the Sub-Forums section back to top of thread list view. I don't know why garry thought it was a good idea to put it on the bottom.
Tested working in Firefox (Greasemonkey) & Chrome.