If you have a blog, then you must have these tools to help you connect with your readers:

 Technorati
The ultimate blog search engine. The first thing you should do after you create your blog is to signup for Technorati and ping it.
http://www.technorati.com

 Digg
Digg allows users to submit articles online with a direct link to the source. Other Digg users can then vote to have the article moved towards the top (or towards the bottom) of the list of popular stories.
http://www.digg.com

 FeedBurner
FeedBurner offers tools to promoting and tracking your blogs and podcasts. It allows users to subscribe to your RSS feeds and if your blog is extremely popular, FeedBurner will help you find advertisers.
http://www.feedburner.com

 Reddit
This is a user generated site that allows users to submit links of their favorite websites. Once a link is submitted, other users can move it up or down on the page depending on its level of popularity.
http://www.reddit.com

Feel free to add your favorites using the comments section below.