for starters. Actually... there's a ton of stuff out there! And for superexcellent stuff on combat-effective applied MAs in general (including a lot of TKD-relevant stuff), definitely look at
Simply go to Google and look in the upper left corner. Select "other" and then "blogs" on the pull down menu and google as usual. Lots of sites will pop up. If you blog and use Blogger you can search through Blogger too. I blog for www.upcomingfloridamartialartstournaments.blogspot.com which lists taekwondo tournaments among others. It has links to other tournament related sites and gets a surprising number of hits each day. If you don't blog, why not start?