I figured I would jump on the chance to share some of my favs from WP.

A couple of WP plugins/widgets that i love are:

All in One SEO Pack
http://wordpress.org/extend/plugins/all-in-one-seo-pack/

Tiny MCE, which also comes with settings in the admin so you can customize which icons show in your editor along with the ability of custom placement for each element
http://wordpress.org/extend/plugins/tinymce-advanced/

AdSense Manager (allows customization of colours for your gooads and such)
http://wordpress.org/extend/plugins/adsense-manager/

CForm with captcha option
http://wordpress.org/extend/plugins/cforms/

there are a few more but these are def on the top of my list.

we mixed and matched a couple of others… by using recent post mod and sticky posts together, the admin can assign a value of 0 or 1 so that the given post will show a snippet in one of the selected sidebars