You can vote for the Twilight soundtrack over at the World Soundtrack Academy. According to the site:
“All soundtrack and film music fans worldwide are asked to cast their vote for what they consider the best soundtrack of the past 12 months (for any film released between 1 JULY, 2008 and 30 JUNE, 2009). The soundtrack that gets the highest number of votes will receive the Public Choice Award. Only one vote is allowed per person. The voting procedure is monitored by PricewaterhouseCoopers.
The voting period is set from 2009-07-01 to 2009-09-15.”
Get full details on the World Soundtrack Academy voting here. TY to Glowie74 for the heads up.