My favorite firefox add-ons:

• ColorZilla by Alex Sirota
• Firebug by Joe Hewitt
• Form Saver by Mike Botsko
• HTML Validator by Marc Gueury
• LinkChecker by Kevin Freitas
• MeasureIt by Kevin Freitas
• Operator by Michael Kaply
• SEO for Firefox by Aaron Wall
• Tab Mix Plus by CPU, onemen
• YSlow by Yahoo!
• Web Developer by Chris Pederick

WordPress plugins used on this site:

• Adhesive - sticky posts for WordPress 2.0.
• Akismet - comment spam web service.

Bookmarklets are completely awesome:

• GmailThis (drag to your browser links toolbar, must be logged in)
• Here is the supercharged GmailThis from lifehacker.

Podcasts I listen to:

• Daily Searchcast - search veteran Danny Sullivan’s daily recap of search engine news
• Future Tense - the latest technology products, I always hear about new and neat sites from this podcast
• SXSW 2007 - Some of these are true gems.
• The Hook - Katie Kempner hosts very well-thought-out interviews of leaders in advertising and public relations
• Wait Wait… Don’t Tell Me! - Peter Sagal and Carl Kasell host the oddly informative news quiz
• Webmaster Radio - contains several excellent web, search and public relations podcasts.
• WSG Meeting PodCasts - doesn’t look like these are being updated, but there are a few gems in this collection