HKEPC has some more info about Intel's Dynamic Acceleration (IDA) technology for notebooks:
Our sources from the PC market told us more about Intel’s next technology – Intel Dynamic Acceleration Technology (IDA). IDA helps in increasing the performance in single thread and seriated multithread. The technology will be introduced in Socket P Merom in the coming Santa Rosa mobile platform.
When running applications at single thread and seriated multithread with a dual-core processor, only either one of the core works, and the other is set to idle state to save energy. IDA is new technology which enables a further performance enhancement in term of raising the clock rate of the working core while keeping the other core in idle..