Hi everyone
First time here I think, just thought I would share this script that I spent the day making. I called it transmission magic import, you can find it on gitorious here: http://gitorious.org/transmission-magic-import
It may not work and I don't have the time to support it but feel free to send patches etc. What it can do is the following: take a directory full of abandoned .torrent files, find their data if it exists, and then add them to Transmission using the remote interface. It's a command-line python script, run it with no args for further documentation. Probably *nix only.
Enjoy!