Tracking

Blogdex
The weblog diffusion index, tracking news and memes as they spread through the world of weblogs.
http://blogdex.net

BlogPatrol
Free statistics for bloggers: hit counters, visitor tracking, top referrer tracking, traffic projections, and keyword tracking.
http://www.blogpatrol.com/

Blogtracker
Service to show the most recent updates to blogs.
http://www.dansanderson.com/blogtracker/

Popdex
Tracking link popularity among weblogs
http://www.popdex.com

Stephen's Web Referrer System
A free to use java referrer system. For blogs, and personal sites in general, who want to see who links back to them.
http://www.downes.ca/referrers.htm