Under pressure, deadline approaching or you just need some graphics for a mockup, good stock can be a real time saver. Here is a list of websites you should be bookmarking.
One of the biggest and probably most popular stock photography websites out there
Some truely amazing stock photography can be found at MorgueFile, a must visit.
Filter the desired stock by colors, no registration needed. Nice and easy!
As the name already says, very uncomplicated website to find the stock you need.
One Free PSD a day, what more can you ask for.[link]
High Quality Textures, PSDs etc. from the very talented designer Orman Clark
The well known online magazine "Smashing Magazine" is publishing Freebies on a regular basis. From icons to complete templates, you name it.[link]
Web Design Leder
Not always completely free but nonetheless a great resource, especially for webdesigners.
I will surely update this list in the future. If you have any suggestions let me know!