MGUVrelax

Specifically to fix the overlapping UVs. Try in conjunction with Lynx's Realx UV plugin (see below).

From the notes:
"Just add MGUVRelax.lsc like a normal plugin (press ctrl-F11 to bring up the plugin manager).
Usage:
THis will smooth the selected points UV values, for untangling overlapping uvs. It works exactly the same as LW's own mesh smoothing command, but with uvs.

NOTE: It makes a morph, so you'll need to deselect that to continue working :P I'll try and fix that when I figure out how :P "