I've used SMC Fan Control for about a year on my 1.83 Mac Mini after it went to the shop for a total overhaul. No problems. Same version of SMC on there now.

Put it on my early '09 2GHz Macbook but it looks and acts differently. Pref choices are not the same.
This version (still 2.2.2) constantly nagging for my password. Most times it wanted it twice before it would take. Every time I changed the speed it wanted my password again. It wasn't doing as good a job with the fan as the Mini's default settings. Don't think it's needed on this model Macbook and sure isn't coming back on board with all that password nagging and reworked preference settings.

It does work great on my Mini so I'll keep it there and try it on my new Mini 2.26 GHz.
When I get some work I'll donate as it has served me well on the Mini and if it does the same on the new one, it's worth it to help them make it work better on all machines.

Yes, I've tried two downloads. I'll rate it on the Macbook's version. Otherwise it gets a 4-5 on desktop.