Top 4 WP plugings for me All in one SEO Social Bookmarking WP-ContactForm WP-Backup through admin panel DON.
Well, here's a post that will definitely help you out. Has some plugins as well as tips and tricks about Wordpress Check it out: http://www.codeitred.com/2008/06/18/wordpress-plugins-tips
still finding my way around plugins, but for me its: All in one SEO Google XML Sitemaps and playing with now .... NextGEN Gallery p.s. when I have a top 5, i will add it
All in one SEO Google XML Sitemaps Dagon Design Sitemap Generator Related Posts ShareThis aLinks WP-Sticky Some paid plugins
All in one SEO is basically the only "have to have" one for me. Beyond that: related posts, Alinks, JW FLV player, and popularity contest (just for fun)
I like All in One SEO, flickrRSS, WP Content Form, and Related Posts. I use a few other ones but I can't think of them at this moment.
Instant Upgrade is a huge timesaver. I also like: Redirection -for creating and tracking redirects (great for fixing 404s as well) Adsense-Deluxe - not just for adsense, but for inserting any javascript into a post
All in One SEO, XML Sitemaps, Google Analytics, WhydoWork Adsense, Akismet, Sociable and Wordpress Stats.
Not in any particular order my favorite five plugins are All in One Seo, Hyper Cache, Google Xml sitemap, Popularity Contest and Socialable. Beside these I'm using several other plugins like Google analytics, Favicon manager, simple tags, You Tube 2, threaded comments, most commented, wp ban, and plugins I cant remember lol etc.
I'm still exploring new ones too but right now I have: Akismet (hey! I must be getting popular, it nabbed the first 2 spam comments the other day ) All in One SEO Pack BackUpWordPress Photo Sidebar Widget WordPress.com Stats (addicted to this one ) and a few others
My favourites are as follows: All in One SEO Pack - A must in my opinion Google XML Sitemaps NextGEN Gallery WP Limit Posts Automatically Wordpress.com Stats