Colour Picker tool

Stumbled across this one almost by accident, just the ticket for picking colours off a palette and getting the HEX/RGB values easily.
http://www.colorpicker.com/

Cross browser testing from spoon

Cross-browser testing your website designs and applications can be a pain. Here's an option. Spoon Browser Sandbox

Wireframe, PDFs, UI Kits - Smashing Mag.

Wireframing kits and UI design kits can come in handy
Smashing Magazine puts together another great resource list
http://www.smashingmagazine.com/2010/08/27/free-wireframing-kits-ui-design-kits-pdfs-and-resources/

Useful tool - Launch List

Another one via Smashing Magazine...
LaunchList
This tool helps you review important items before the big launch. By default, the tool provides 28 items to be checked, but it also allows you to add custom items to the list. Each item can be commented on or crossed out. Once you’re done, you can send the report along with project’s details to multiple recipients via email. Alternatives: Ultimate Website Launch Checklist and Paul Boag’s The Ultimate Website Prelaunch Checklist.

useful tools - colour variations

A simple tool that helps web designers find variations of any color. Simply pick the color that you want to start with and 0to255 gives you a range of colors from black to white using an interval optimized for web design. Then, just click the variation you want to use and the hex code is automatically copied to your clipboard. - http://0to255.com/
Another great post from Smashing Magazine - tools post

Useful tools - multiple apps installer

Ninite lets you pick your favorite software from among an extensive list (Web browsers, messaging, media, images, documents, security, runtimes, file sharing, utilities, compression, developer tools and more), creates a batch installer for them and then installs them for you automatically.http://ninite.com/
Alternative:Allmyapps allows you to bundle your favourite applications, install them in a single click and reinstall them whenever you need to.

Useful tool - dummy image creator

This online tool generates dummy images for you site: you can specify size, background and foreground colors, image format and add custom text. You can also use shortcuts for several standard dimensions including ad sizes (mediumrectangle, skyscarper, leaderboard etc.), screen resolution sizes and video standards (ntsc, pal, hd720, hd1080). http://dummyimage.com/

Useful tool - Tableizer

Clients often provide data in spreadsheet form, and reformatting it into HTML can be a real pain. This tool generates HTML tables out of spreadsheet data. Just copy and paste the cells from your spreadsheet, choose your options (font, font size and header color) and you have a properly formatted HTML table for your data. http://tableizer.journalistopia.com/ -

Another great post from Smashing Magazine - tools post

Language Typography

Smashing Magazine have done it yet again, just a really really interesting and detailed post about different languages and the typography / art / calligraphy.

The beauty of typography writing systems and calligraphy of the world.

HTML 5 - some details

As a reference to what's new in HTML 5 this site gives some good information
http://www.threestyles.com/tutorials/html5-rocks-my-socks-off/

When can I use....

Here's another gem, all browsers, compatibility in table format for each different rule...
http://a.deveria.com/caniuse/ wicked!

CSS 3 - help

If you're keen as mustard to get cracking on some css3 gems, but not sure about the cross browser thang, looky here! http://css3please.com/

Social Networking - under control!

Just to point out a really clever bit of software for managing all your social networking sites, in one place with out any hassle.
Digsby is just the ticket, monitoring gmail, yahoo, twitter, linkedin and facebook, while running Instant Messenger.
Great, pop up boxes with notifications, just enough to let you know without distracting.
Highly recommended piece of software.