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RSS Hacks and Tips :
10 Useful RSS-Tricks and Hacks For WordPress | Developer's Toolbox | Smashing Magazine

Multi-User Wordpress Install :
WordPress MU › Home

BBPress, Wordpress integrated Forum :
bbPress » Home

Wordpress Theme Kit
WP Themer Kit - WordPress

BuddyPress, turn wordpress into a social network :
BuddyPress » A Wordpress MU Based Social Network Platform

Job Board Script :
WordPress Job Board Script | BlueFur.com

Wordpress Template Tag List :
http://www.dbswebsite.com/design/wordpress-reference

Ad management :
WordPress › WP125 « WordPress Plugins
OIOpublisher - Control Your Ad Space

Random Image Plugin :
Random Image Plugin for WordPress - Justinsomnia

Caching (good to survive a digg) :
WP Super Cache

Different Post templates for different categories :
guff : Post Templates by Category

Different RSS Feed for each category :
EsLoMas.com » Disponibilidad de canales RSS específicos

Wordpress SEO Plugin (great - every install should use this) :
WordPress › All in One SEO Pack « WordPress Plugins

Affiliate Link Cloaker :
Wordpress Link Cloak - Hide Affiliate Links in Wordpress

Spam Protection :
Stop Comment Spam and Trackback Spam « Akismet

30+ Plugins to Make Your WordPress Blog More Social :
30+ Plugins to Make Your WordPress Blog More Social - Mashable

The 7 Weirdest and Wackiest Uses for WordPress :
The 7 Weirdest and Wackiest Uses for WordPress - Mashable

Wordpress Themes :
WordPress › WordPress Themes
Download free WordPress themes - Free WP Themes
Top Wordpress Themes - Best Free Themes for Wordpress
WordPress Themes
WordPress Themes: WordPress Themes for Small Business; WordPress Themes Tutorials
41 Great Looking Free WordPress Themes | Wordpress
Starkers: The completely naked theme for WordPress - Good starting point for theme creation


These are a few of my bookmarks, feel free to share yours as well.