There is a wealth of valuable resources on the net - it's all a matter of being able to find them. This is a categorized collection of web design resources I've found useful. Ten random entries appear below.

EasyRGB Color Harmonies
This tool gives you twelve complimentary colors from a user-defined base color.
WebPageFonts.com
6,500 free TTF fonts.
Character Entity Reference
HTML entities are the codes that allow you to use characters such as © and ½. WebDevelopersNotes has a good listing of them here.
Warren Kramer Design Tutorials
Excellent graphic design tutorials
12 CSS Tricks / Tips
A nice compilation of links with 12 nice CSS techniques
The PHP Resource Index
Documentation and stealable scripts.
Graphics N Graphic Design Blog's Free St
Another long listing of free stock photo sites
WebWhirlers Color Wizard
A great tool, written in VBS, which takes a user-defined color and spits out all kinds of complimentary colors.
SlayerOffice Color Palette Generator
A useful tool which creates 10 shades of a base color at varying degrees of opacity.
Article: Color
A good article on using color on your web page.