Kid A by Radiohead never ceases to inspire me. Everything about it is thought provoking. The sound design and production leaves me scratching my head, the lyrics and vocal melodies are so haunting they really hit home with me. I guess I should include Amnesiac too since they were born out of the same studio session, just released separately.
I know a lot of people have a 'vision' before they start a song off, but sometimes for me the most inspiring thing can be to open up my DAW, flip through some instrument presets or grab my guitar, insert random drum loop, and dick around until I find a melody I can run with. Works for any genre.

p.s. totally digging the new smilies. LOVE the smurfs