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HTML Color Codes
The interface here is so user-friendly, and more than hex codes are offered here. It's kind of fun to browse through the pages. You'll find a host of other resources, including high quality free stock image websites, tutorials, and generators.
A considerably large cache of html symbols, characters and their codes.
Color Picker online
No photoshop? No problem, you can still code up a color-fluid layout with this online color picker!! :o
Ascii Code Chart
One of my go-to caches for ascii codes. Simple, but a nice little library.
Free stock images! All of these are high quality, and there are SO many to choose from. This is probably my favorite resource, period.