Tools
My Favorite Tools – Enjoy 
Color
Color Scheme Designer – Fantastic tool.
Color Picker – easily find variations of a color.
Color Schemer Tool – finds colors that look good with a color.
Color Picker – finds colors that look good with a color.
Color Palette Generator – generates a color palette from a photo.
Whats Its Color – generates a color palette from a photo.
Color Hunter – generates a color palette from a photo.
I Like Your Colors – gets the colors used by a web page.
Colour Lovers – lots of color palettes to choose from.
Get Flickr Creative Commons Photos by Color
Copywriting
Replace Rational Words With Emotional Words – use this tool to find words better suited to sell (emotional words).
CSS
CSS Layout Tools – great list of resources by Vandelay Web Design.
Design
For Webdesigners – 556 helpful links for webdesigners
Domains
TDNAM – GoDaddy’s site to purchase existing domain names
Nameboy – tool to help you choose domain names
Feeds
Feed Analysis – analyze your Feedburner feed numbers
Hosting
HTML
Icons
IconsPedia – free icons
Images
How to find photos you are allowed to use on Flickr – Skelliewag
Keywords
Wordtracker Free Keyword Tool – finds keywords and number of searches
Google AdWords Keyword Tool – relative search volume, estimated CPC, trends, site-related keywords…
Google Search-Based Keyword Tool – get ideas for keywords
Google Adwords Traffic Estimator – gives CPC and estimated clicks per day
Seo Digger – finds the keywords for your site, and how you rank in Google for them. Great tool.
Seobook Keyword Tool – gathers a lot of information from different sources – very helpful.
Chain of Thoughts – gives you related keywords in a tag cloud, so you can keep going deeper.
Solo Seo Link Search Tool – lots of searches in one place – try it!
AdWords Wrapper Tool – easily adds “quotes” and [brackets] to your keyword list
Keyword Density Checker
Linkbuilding
Page Rank
Live Pagerank – checks Page Rank on multiple Google datacenters. Good for when Page Rank is in the process of being updated.
DigPageRank – another Page Rank checker like the one above.
Live PR – another PR checker, this was the only one working, last time I checked.
Productivity
Time Management for Creative People – free ebook.
SEO
SEO Tools – Aaron Wall’s collection of SEO Tools.
Index Rank Tool – ranks your site according to how quickly it is growing in Google’s index.
Cool SEO Tool – shows top 10 results in Google and analyzes them.
SE Spider Simulator – see your pages as a Search Engine spider would see them.
The Top 500 – the top 500 most important domains on the internet, according to SEOmoz.