As announced on the projects page, for the first time I will release code on kairho.net (TADA!). It's a VB Script I wrote for the guys at ro:ladder to add a protocol handler for Red Orchestra links (ro://IP:PORT) to Internet Explorer and Firefox. This way you can click on links to RO Servers to launch the game without any extra software needed.
You can download the script here. If you experience problems, feel free to contact me.
Some interesting links to related technical articles:
Registering an application to an URL protocol
Adding a protocol to mozilla (this is overkill though)
It was quite a struggle to find out you just need to add one line of code to user.js in your Firefox profile directory to add the protocol handler to firefox.