I have had a couple of comments now regarding the noise when shooting at hi ISO so I thought I would give you the program that I use.
Its a free download and adds as a filter in Photoshop or can be used on its own.
Choose the relevent download and away you go (Usually 32bit as this as the standalone part).
Hope this is of use, I use it on nearly every photo I take, it not only reduces noise, but sharpens at the same time. Very handy to have.
Remember less is more and not to over do it.
Sorry if this is something everyone knows about.