I think I'm going to make this into a series since there are so many out there. I don't know if these are the most complete soundtrack playlists out there, but they are extensive and I know how much effort it takes to create them.
Glee by Tinkerbell101
Sopranos by Vef
Boardwalk Empire by Albert Mill
Romanzo Criminale by Albert Mill fairly unknown tv-series, very worthwile!
True Blood S1 by Matt Lowden
(also check out his other soundtrack playlists for True Blood and various games)
True Blood Season 1
If you have a spotify playlist I should know about (yours or someone else's) just let me know in the comments. In other short news...if you can point me to tracklists for season 7 and 8 for Weeds I'd be very thankful!