So, here's some from my friends list, that are off the beaten path, straight to you!
hitherby_feed - Hitherby Dragons is sort of like a webcomic. But it's prose. I challenge you to find a more creative and consistently high quality fiction site on the Internet. Strange mythology-inspired stories, bizarre parody, and beautiful prose, by Rebecca Borgstrom, writer of the award-winning RPG Nobilis.
gadflyer - Gadflyer.com is a new site for Progressive Liberals, with teeth that the movement has been historically lacking. Smart, insightful, and utterly without fear. I predict this will be a must-read for anyone on the left who is politically inclined.
will_carroll - Will Caroll is an author at the sublime shrine to modern baseball analysis, Baseball Prospectus. He has a group weblog, that focuses on baseball but also talks about politics (with a left slant), music, and technology trends.
There are hundreds more out there, and more every day. Being able to watch content-rich sites for updates on your lj friends page is something that's tremendously useful, so for those of you just gaining this feature, enjoy!