Applications

SkinnablesA website dedicated to various skinnable applications and shell replacements

Blender3D

Enhance your Blender renders with textured lightingReally good lighting tutorial (including light masks)

Blogs of note

Haz’s BlogThe blog of fellow technophile, nerd and computer geek; Haz.

Free resources

ImageafterFree high-resolution images for use in 3D projects and so on

Web Development

Colour scheme designerA really cool online-based colour scheme designer. You pick a starting colour and it will show the compliments of that colour (or any other colour relationship that you want). It even simulates the scheme as it would look to someone with visual impairment
W3 Schools Online Web TutorialsPossibly one of the best online resources for learning more about new (and existing) web technologies.
HTML entity codes (ISO-8859-1) referenceA reference of HTML codes for special characters (e.g. non-breaking spaces and those funny little chevron things)

Wordpress Links

Complete PHP function listA complete list of the functions available in Wordpress
Wordpress template tag listList of all the tags that can be used in a template