I have an ATI Radeon HD 6950 AND 6850. If I get a better power supply I could bridge them and get SWEET graphics power out of it. That'll be a while before that happens.
Unfortunately, these two cards are not bridgeable. For the most part AMD Crossfire is only compatible with cards from the same numbered series. If you got a 6970 it would work with your 6950, for example. 7950s are getting cheaper now. Bottoming out at 200USD. Pretty decent bang for your buck.
I just went from a 6850 to a 7870Ghz and I'm not that impressed. Gonna try out a custom PCB 7950 OC since it's the largest card that will fit in my case at the moment.
The price drop must indicate the 8000 series is not so far away. I'm hoping for better cooling and smaller sized cards with good capabilities... not things like the 7990. Nvidia's $1000 cards are gorgeous but I like OpenCL and Radeon has Nvidia completely drunk under the table when it comes to that, and for a fraction of the cost generally.
Recently I've been building some cheap client systems here and there for people I know. I don't see many new technologies that aren't gimmicks coming our way in the next year or two. One thing I'm interested in is something called the Occulus Rift--virtual reality headsets will be the future of gaming displays, perhaps. They will be cheaper than giant monitors and much more immersive. Think FFVII remake: you see things through Cloud's eyes.