Primespeed is a interesting little benchmark, that calulates your CPU peformance based on the number of primes it can calculate in one minute. I (michael) originally wrote this software in Turbo Pascal on DOS, but after finding some time after 1.5 years, it now compiles in GNU Pascal, thus increasing it's portability (and I don't have to mess about with emulators, and I'd never have a native bulid, etc.).
Primespeed v0.4 is availible in two packages: one that contains both the source code and a compiled Linux x86 binary, that should run on i386-based Linux distributions, and a source only version if you have the GPC (GNU Pascal Compiler) already and want to set other options on your compiler.
You can grab primespeed, submit bug reports, feature requests, etc. at the project page.