This is a Greasemonkey script I developed to help organized people to save time (and frustration, caused by the bad youtube interface) when adding videos to playlists. Youtube simply didn't want to show the playlists sorted alphabetically (they show them sorted by last used... not practical at all for me), so, being annoyed, I fixed it! ;-)
Please note, I didn't update this script since ages. I'm not even sure if it works anymore, use/try it on your own risk...
Installation: you must have Greasemonkey - or Tampermonkey if using Chrome - installed, then browse to Youtube - add to - Playlists sorted alphabetically, click on "Install this script" and confirm.
Compatibility: Firefox 9 (Windows, Mac), Chrome (Windows, Mac)
If you like this script, share it with yout friends, rate it at the Greasy Fork script page, post it on your facebook or g+ wall etc. ;) thank you.
My old script was downloaded more than 17'000 times (December 2013). I'm quite proud of it.