When I last tried Bochs (around 6 months ago) it still was unbelievable slow.
Bochs is more like an experiment, as it emulates the complete processor while others (like VMware) pass all instructions on to the real processor.
So Bochs is able to run x86 OSes even on other hardware (like PowerPC, Alpha, ...), but the speed factor real : virtual is around 400 : 1 to 1000 : 1.
It's not much fun to run a virtual Linux, Windows or whatever on a virtual machine with the emulated speed of IBM's very first PC.
You can get a little more speed with Plex86, but it still is around 10 times slower than VMware.
Depending on what you want to do, take a look at FAUmachine (formerly UMLinux) or User Mode Linux.
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