Currently Being ModeratedDec 22, 2012 2:01 PM (in response to prof d hall)
I'm not aware of any free good denoiser.
Neat video has a trial, but I think it's either watermarked or limited to SD. But it is really good and the trial will give you an idea of what iyt can do and whether it's worth the outlay for your purposes.
Another option is Adobe After Effects. A bit of a learning curve, but they have a trial.