dunno-
Here’s one: blackfridayhome.com
Year-around bargain-hunter sites, which will (I’m sure) also have BF info as the week progresses:
SJSinNYC mentioned one I’m not familiar with: slickdeals.net
Joseph brought up another point – the Monday following Thanksgiving is called “Cyber Monday” with many online specials available (largely electronics)
Googling “black friday” ads results in over twenty million hits, so this is just to get you started.
Info is updated on these sites as we get closer to Friday.