There is a new iMix on Apple's iTunes site that says its a list of music from Episodes 1 to 6 of Season 4. There's some great stuff on there.
Here's the link:
Alias Season 4 iMix
Here's the list:
Norah Jones - Sunrise
Michael Lord - Bleed
Jet - Cold Hard B*tch
The Von Bondies - No Regrets...