My top 5 websites are, in no particular order:
-Kuler (http://kuler.adobe.com/). Perfect for design inspiration or when I need to find a complementary color.
-Design Seeds (http://www.design-seeds.com/). Again, more design inspiration. The combination of the color palettes and images is fantastic.
-Fab.com. The items for sale here are unique. Every day, I find something else I'd buy for myself or as a gift. Fortunately, I have a bit of self-control and I don't spend every dime here.
-Etsy (http://www.etsy.com/). I have never bought anything from Etsy, but I use it more as a source of inspiration and a muse. I love seeing what other people are crafting and creating. It helps percolate ideas in my head.
-Evernote (http://www.evernote.com). More of a service than a site, per se, I use this site more than just about anything else. Whether I'm storing a pic of my son's school schedule for when he eventually loses it, or jotting down names of artists I dig while at the book store, or getting a project idea in the middle of nowhere, Evernote has me covered. I can't remember much of anything on my own. I depend on Evernote to keep track of those things that I can't.