Gelato for free (no it is not about ice-cream)

Gelato is an application developed by nVidia to allocate not used GPU resources to boost specific applications such as Maya or RenderMan. It is a plug-in, working with nVidia graphic cards, from the GF FX5200 and beyond.
While a Pro version costs... 1,500US$, nVidia is proposing a features-limited but free version. Well, the only problem is ... there is no Mac version yet (only Win and Linux).
We should be able to get similar features and performance enhancements with Core Image and Core Video (introduced with Tiger), but such technologies are not really used by developers yet.