Popular recruiter blogs
I mentioned recruiter blogs as a good source of insights into the recruiting process and the job market (plus the occasional job listing). For some more ideas on where you might start, take a look at Michael Specht's new web site, HRblogs.org. In particular, he lists popular blogs by category (Via Recruiting.com). Some of my favorites are listed, as well as some that I'm going to have to explore.
The key to discovering blogs that will be useful to you is to explore, and when you find one that you like, find out what that person reads. Follow the links in their posts and blogrolls, and you will find new sources for your personal information environment.