I have always been a fan of open source and wanted to contribute some code to a project or two. Somehow, I never found a project I would really enjoy and could directly benefit from as well. I was simply looking for an project that would scratch my itch.
Finally while working on an e-commerce system for my company I have decided to use active_merchant to connect to PayPal. The original implementation used by active_merchant was targeting and older xml based gateway and I have decided to re-implement the gateway using more recent NVP (name-value pair) interface. Hopefully this will allow for more modern features of the PayPal service.
A few days ago Cody has committed my patch and it is currently part of the active_merchant main code.

I have also created git repository where I can add more functionality as needed.
Here is the link for the interested:

git clone http://git.furmanek.net/active_merchant.git

Enjoy.