Best support acts I have seen were LightsAction supporting Saosin - in fact they were much better than Saosin live.
Also Sion supporting Oceansize. Oceansize were much much better, but Sion were a good opening act.
Oh, and definitely Men, Women and Children supporting Lost Prophets. Absolutely superb.
Not many others have been much to write home about...
Guitars: Eko 100 Series Custom, Eko 100 Series Framus, Epiphone Firebird, Epiphone Special II, Yamaha FG-403MS
Pedals: Danelectro Dan-O-Wah, Danelectro Fish & Chips 7 Band EQ, Danelectro PB & J Delay, Danelectro Tuna Melt Tremolo, Danelectro Pastrami Overdrive, Danelectro Black Licorice Beyond Metal
Other Gear: Crafter MA-5 Amp, Korg Kaoss Pad 2