Apple has produced a sample application, to demonstrate their "Velocity Engine", which uses the vector capability of PPC chips, G4 & G5.
http://en.wikipedia.org/wiki/AltiVec
It happens to be a factorization program! :)
http://developer.apple.com/samplecode/VelEng_Multiprecision/index.html
The program proceeds by trial-division, then rho, and finally ECM - and is quite fast...
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