Userscripts.org has thousands of scripts for turbo-charging your favorite websites.
For the first time, Safari Monkey let's you unleash this power in Cuptertino's browser of choice.
First, you will need to sign up for a Safari developer account and obtain a valid certificate. Start the process here. If anyone has a suggestion on how to make this process quicker, please send me a message.
Next, find a script at http://www.userscripts.org and copy the url (or code ID number).
Next, run
./safari_monkey.py http://userscripts.org/scripts/show/NNNNN
or
./safari_monkey.py NNNNN
The scripts creates a new Safari extension scriptNNNNN.safariextension
Open up Safari and install!
I have only tested a handful of scripts, so more testing is always a good thing
It would be great to have the script create the .safariextz files, but I am not sure how to do the code signing