These are my personal favorites in graphic designing. I am listing out here. May be Useful you too..

1. cgtextures.com  - for texture download

2. tutsplus.com-  for good tutorials in all fields of designing

3. brusheezy.com -  for photoshop brushes download

4. designflavr.com - for design inspiration

5. designchef.com - Design community

6. coroflot.com - useful to get freelance projects (as well full time jobs)

that's all now. May be catch u next time with a bigger list....