Google CSS

Always test your site in many browsers, so go with crossbrowsertesting.com.

Always find a good team that you can work with for coverting PSD files and indesign files to html, css and javascript, here is a good one that I know of call xhtmlized.
Another firm is http://xhtmlweaver.com, I have never used them.

Site Design:

• zurb.com, a bit more expensive but they’ve worked with tons of startups.
• electricpulp
• A ton more web design firms
• CrowdSpring, personally I have never used them.
• 99designs.com.

Some design firms I haven’t tested out:

• simplefoliotheme

This is a great place to find stock photos for you sites

• istockphoto.com

MS Windows editors:

• Notepad++, some tips can be found here.

Online resources:

• gomockingbird, one of the best wireframe tools ever.
• CSS Cleanup Tool
• HTML Cleanup Tool
• Blueprint CSS Framework (e.g. Example)

Create a favicon.ico

Firefox development plugins:

• Add N Edit Cookies
• DNSStuff Toolbar
• Netcraft Toolbar
• EditCSS
• Firebug
• Html Validator
• LinkChecker
• Server Switcher
• Total Validator
• View Cookies
• Web Developer
• YSlow
• IE Tab
• Page Speed from Google
• HttpFox, to view GET and POST data from HTTP requests
• Fiddler, to view GET and POST data from HTTP requests

Google Chrome plugins:

• Web Developer

SEO Tools:

• Free SEO report
• The Top 15 Free SEO Tools

Certificate Verification:

• Validate Your Verification

Color palattes. Create a good one
avivadirectory
colourlovers
colorcombos
www.degraeve.com/color-palette/

Charting
protovis