Google and Yahoo get sued on a regular basis, often by tiny outfits with no chance of winning. But now, the two companies are facing a much more serious lawsuit, as Xerox, which has a market cap of almost $8 billion and a genuine legal team, is taking them to court. Xerox claims that Google and Yahoo have infringed on two patents it holds. Susan Decker explained earlier this morning, "One patent, issued in 2004,