The 10 WordPress Plugins Everyone Should Have listed by Webmasters by Design are: WP Google Analytics, FeedBurner FeedSmith, WP-Polls, WP-PostRatings, WP-PostViews, Sociable, Google Sitemaps Generator, CForms, Search-Highlighter and All in One SEO Pack.
I’ve been using Firefox 3 beta, which is the default version provided with Ubuntu 8.04, a.k.a. “Hardy Heron”. It’s quite good, but it’s hard to tell which plugins are compatible with it. Luckily there’s this guide — 20 Top Add-Ons that are Ready for Firefox 3 — covers some of the most useful Firefox 3-compatible plugins out there.