UK domains for sale and at auction
Sedo UK Auction (http://www.sedo.co.uk/search...)
eBay Domains (http://computers.shop.ebay.co.uk/items/Domain-Names)
NamePros (http://www.namepros.com/cctld-domains-for-sale/)
Affiliates4u (http://www.affiliates4u.com/forums/domains-websites-sale/)
Digital Point (http://forums.digitalpoint.com/forumdisplay.php?f=59)
Site Point (http://www.sitepoint.com/forums/forumdisplay.php?f=69)

Dropcatch services
Drop System (http://www.dropsystem.co.uk) *UK domain specific
Caught (http://www.caught.co.uk) *UK domain specific
Pool (http://www.pool.com)
Snap Names (http://www.snapnames.com)
Name Jet (http://www.namejet.com)

Domain research tools
Internet Archive (http://www.archive.org)
Cambridge Dictionary (http://dictionary.cambridge.org)
WordTracker (http://freekeywords.wordtracker.com)
Google UK keyword tool (https://adwords.google.co.uk/select/KeywordToolExternal)

Web design resources
Browsershots (http://www.browsershots.org)
IE Netrenderer (http://ipinfo.info/netrenderer/index.php)
HotScripts (http://www.hotscripts.com)
CSS guide (http://www.w3schools.com/css/)
Webref (http://www.webref.eu)

Affiliate Companies
Coming soon

Wordpress Themes
Coming soon

Joomla Themes
Coming soon

Domain Related Events
Internet World (internetworld.co.uk)
Internet Week NY (internetweekny.com)

Recommended Books
Some useful coding (HTML, PHP, XML, CSS etc.), web design, domaining and related books:

PHP and MySQL Web Development

CSS The Missing Manual

Head First with CSS and HTML

Sam's Teach Yourself XML in 24 Hours

Web Design for Dummies

The Domain Game

Joomla! A User's Guide

Building a WordPress Blog People Want to Read