by Zurb is my favorite when looking for specific website patterns like filters, tables, etc. :)
I really like http://dribbble.com/
I really love these websites and found them pretty inspirational :
http://thenounproject.com/ (pretty useful too)
Hope this websites could inspire you too
I mostly use Behance and Dribbble.
Abduzeedo.com and behance.net
I use popular sites that others have mentioned like behance.net, dribbble.com, ffffound.com.
I also use gimmebar.com
Dribbble.com all the way. I wonder where did they learn to design those beautiful skeuomorphic icons...
tumblr is still the strongest source for me. couple of cool ones:
http://the-book-design.tumblr.com/ - nice selection of book covers and layouts
http://ficciones-typografika.tumblr.com/ - typographic experiments, posters
http://blog.wearerifle.com/ - tumblr of a cool studio who does some really great magazine layout stuff
http://aessestudio.tumblr.com/ - nice selection of identities and typography
http://andren.tumblr.com/ - typography experiments
One of my biggest design inspiration (when it comes to minimalist designs) is Pugly Pixel.
She doesn't complicate things, and she has some tutorials too.
Depends very much on what the project is.
as a web designer, i can recommend these:
+ tumblr, pinterest