In short, it is very good to feel the speed
Main advantages of kernel 2.6.37 are improvements in ext4, SSD handling improvements, big kernel lock removal, 200 line patch ... and lots and lots of other changes. Read more from kernelnewbies
All in all, we can start unleashing the power of multiple cores. When one of your core is compiling source, another one you browse and another one copies data in the background and another one serves clients
Kernel 2.6.37 rocks