The right music can really help me get into flow while on working on something, especially when wireframing. Here's some of the stuff I listen to the most when wireframing, hand-picked to be less intrusive, but not all of it falling into ambient territory. Somewhat verified by my Last.fm profile. And in no particular order ...
2. Brian Eno
3. Hans Zimmer - Inception Soundtrack
5. Cinematic Orchestra
6. Massive Attack
7. LCD Soundsystem
8. James Newton Howard - Michael Clayton Soundtrack
9. Nine Inch Nails - Ghosts I-IV
10. Sigur Ros
Also: Fujiya & Miyagi, Hot Chip, UNKLE, Four Tet, Boards of Canada, Free Association - Code 46 Soundtrack
What are some of your favorites? Add 'em in comments.