I own a canon 1d (yes the classic!) and if you know anything about the 1d you know it's infamous for its banding issue. Well
after doing some research I found some helpful plugins and actions that help remove this issue from my images and also help
remove some noise from some high iso shots. The best (and most expensive) is fredmiranda.com's LP ISO-BR tool. It's 15.00
over at FM but is well worth it from what I hear. The next is a little cheaper (as there's a demo version) NeatImage is more
of a ISO noise reducer plugin, but I have found that it works well with helping my banding issue. You can find the plugin at
neatimage.com. The last I found through the first of my google attempts to fix my banding problem, is an older site that
addressed this issue back in '02. It's from Tow.com you can find the article
here. This was the first tool that I tried but it didn't seem to
work in my version of cs3(beta) so maybe you can try it out. Anyhow I figured any digital photographer could use these
pieces of info whether they have a "banding monster" like my 1d or just want to clean up their images a bit. Enjoy!