Yeah, it's the biggest retail sales day of the year in the US. It's when retailers sell a bunch of shoddy products for cheap and people think they get great deals. There are some legitimate good deals to be had with quality products, but the supplies are extremely limited and only a few people will get them.
In other words, it's far more hype than substance and people buy into it year after year. I'm not your average consumer though so I'll admit by bias toward this day.
Last year (maybe the year prior) I went to Best buy to get the "WWE Hell In A Cell" collection.
I waited in line for an hour and a half, but it was half off, and I think it was worth it, plus it helped me out with writing stories in my notebook and stuff.
This year I may try and do this again, I have leftover birthday money from my neccesities to spend, I'm thinking either a WHC belt engraved "Randy Orton" "Edge" "Undertaker" or "The Rock", or a shit ton of DVDs.
Last year was the first year I actually stood in lines to get something. I went to Target and got two 32" HDTVs for $250 each. Then a month later ended up buying a 52" so neither ever get used, but they were a good deal. This year Target has a 40" for like $298 I think, if anyone is interested...
If you're in the UK, check out Amazon this week, they usually have really decent deals on. Seeing as for some reason I paid for Prime, the free next day delivery means they may has well just have direct access to my bank account.
Still not exactly sure what this sales in aid of, but it seems to work out well.