Noise reduction!

[joe-wjc-mitchell]

Whats your favorite noise reduction (free or not) software
Plugins for photoshop and lightroom count to!

Mine's imagenomics Noisware - its so good! (plug in for photoshop cs5)

[Zazu]

I tend to find that the default noise reduction lightroom applies is good enough. If need be, I've found noise ninja to work well in the past.

[Magus]

I use Topaz Denoise filter, an expansive noise filter plugin for PS.