Yeah.. it really does have a nice indie sound to it... that's probably why I found it so appealing. Dude... I had the same problem, too... I had somehow read that the song was James - Born of Frustration, but it turned out I was reading a post from June of LAST year (2002). Doh! Yeah.. that is so not the song.
Right now I'm awaiting a call back from Starwood's (Westin's parent company) director of advertising.... left a VM a few min ago... I hope she calls back~!

:> In this commercial, you hear an indie-guitar style riff accompanied by studio drums..
>> It shows people flopping on beds, lots of white.. and it fades intermittently to more scenes of people walking around rooms, then shows the westin hotel.. yadda
>> I have seen about 2 or 3 different commercials from this company that has played the same music over and over. This is a relatively new one.. it's not the James song 'Born of Frustration..' and sounds nothing like it.
>> Instead the song sounds like an indie band.. and it's pretty cool :) I'm wondering if anyone here knows it?