Shortly after DirecTV blessed Knoxville, Tennessee residents with HD locals, along comes Comcast to beef up its own high-definition lineup. Effective immediately, subscribers in the area can tune into History Channel HD, Discovery Channel HD, Animal Planet HD and Sci-Fi HD. According to tipster Shane's count, these four newcomers bring Knoxville's total HD options to 29 -- not too shabby, eh?

[Thanks, Shane H. and Blake]