I heard about noise reduction software, in particular Noiseware, and a quick google search netted me the free download version. What it does is takes photos that for whatever reason have too much grain in them - old film, badly exposed, scanned - and takes it out. Pretty simple and very necessary.
I don't know how well you'll be able to see it, but I took a file of a scan of a picture taken with film that was several years old, so pretty much the most grain a picture can have without being uselessly degraded. And while the picture still retains that soft ambiance, the grain is gone!
This is nice because I have photos I'd love to use in various capacities but felt limited because of the grain. (For example, my Advantix pictures from a previous post - film that was scanned and then put onto a disk, giving it a charming quality but not exactly a useful one)