I've been working on something in the background the past few months-- software to make it easier to tag Film/TV tracks with mood keywords. Right now I only handle mood keywords, I'm hoping to add genres and other things later. Also, I only have a version for Windows, nothing for Mac.
You can download the software for free, nothing for sale here.
Please stop by http://www.tagatune.com ... Feedback on both the site (which is very basic) and the product welcome!!
Happy mood tagging!

Casey
http://www.tagatune.com