In an announcement released today, Nvidia made us all aware of some serious allegations against them. Together with AMD/ATI, Nvidia has been targeted with 51 civil complaints, all of them oriented around price-fixing and anti-competitive agreements. Due to the fact that Nvidia and ATI composed almost the entire market for discrete graphics cards (Intel still reigning in supreme for GPUs overall), it isn't a surprise that they have come under scrutiny. Both Nvidia and AMD are now being subpoenaed for more information. Of course, Nvidia denies the claims and says they are without merit.
You'd think with only two huge companies competing in such a well-known market, price-fixing would be the last thing they would try to get away with. Interesting, though. What damages the complains are seeking, if any, wasn't made known.