Like several have already mentioned, I use Lightroom to organize, because my tagging info got saved straight into each preview's metadata. This has helped me tremendously, especially last year when I was switching to a Mac and had to port over my catalog/s. I just linked to the parent folder where my stash was and when I opened my catalog, all my tags were intact
There's a more detailed process on my organizing here:
http://mrshobbes.wordpress.com/2011/...-im-organized/
My keywords list is here:
http://mrshobbes.wordpress.com/2011/...he-misc-stuff/