In order to be used in a desktop-style multi-processor system, each CPU needs to be able to communicate with the others to ensure that they have a consistent view of the system's memory. This function is known as cache coherency. I believe that since Pentium M processors were targeted for the power-conscious mobile market, such features supporting power-hungry multiprocessor systems were omitted.
It seems that Intel is increasingly turning towards multiple processors (and similar approches), in order to continue improving performance. So, you may start to see multiprocessor or multi-core notebooks, in the next couple years.
I believe this isn't the best forum in which to discuss specs for your next video editing sytem. I recommend the following site (click on the link "Forum List", on the left), and wish you luck:
If notebook is not imperial, you should try Intel's Pentium 4 Extreme Edition.Depending on the software your are using, whether it is threaded or ot, L3 cahce and HyperThreading may help your more than single CPU power.
You can rest assure thatfuture generalof Pentium M will have dual core capability. That also demands that your software is threaded and will be recompiled for the CPU your are running.