The RealTemp basic feature set is about done. I don't have plans to continually add features until it is big and bloated. The next thing I might add is G15 keyboard support. That and maybe a RivaTuner plug-in are the only things I can think of at the moment that might be useful.
Intel is finally going to fully document their 45nm temperature sensors on Thursday at the IDF. Anything I learn from that which will increase accuracy, will quickly be added to RealTemp.