according to geekbench, if you have the 2.67 GHz model, your computer scores a 5569.
the newest mac mini scores a 8573 on the sever model, and a 6472 on the high-end non-server model. so based on whatever geekbench uses, the new mac minis are more powerful.
According to Geekbench x64, I pull 11,000 on my 15" MBP 2.2Ghz with 8GB RAM.
that's about the same as my 17" with the 2.2 and 8gigs ram... so? his is last generation processors- they are a lot slower.
For general computing, no, the mini will not be any faster. A faster CPU does not translate into a faster overall computer. It only helps in benchmarks and CPU heavy apps.