I noticed that FullTilt heavily emphasize that Rush Poker is patented, so I decided to look into it.
It turns out that FullTilt are not the owners of the IP around Rush Poker, and they have licensed it from a third-party who claims the rights to the invention. The patent has not yet been granted, and is in a provisional state pending review and the grant process. The provisional patent for Rush Poker was filed in July of 2007, and you can read the filing here:
http://www.google.com/patents?id=xh2...age&q=&f=false
An interesting read (you can see the names of the people who make claim to the invention - two guys based in the USA).
The FullTilt website claims that 'Rush Poker' will aggressively pursue any and all infringements of its patent claims. I couldn't find any corporate entity called 'Rush Poker', at least not in the USA - but I doubt they can make a claim against any other site implementing something similar to Rush Poker while their patent is still in a provisional state (anybody can file a provisional patent, getting them approved and granted is a whole other matter).
Rush Poker is really catching on, and there is a prospect that it transforms online poker completely, especially for the more casual player. Is anybody else concerned, as I am, that a single company may hold the right to implement Rush Poker? FullTilt seems to have done a deal with these guys, and I wouldn't be surprised if it is an exclusive deal (which tilt would have paid handsomely for).
I have been hearing about ideas similar to, or almost the same as Rush Poker online for years, I believe it has even been discussed on these boards. If there is any 'prior art' out there, now would be a good time to find it and publicize it, in an effort to prevent the patent on Rush being approved and/or being held up in court.