Vanity is an open source, volunteer project, and could always use some help. If you have questions regarding anything mentioned below or in another way related to Vanity development, contact the Vanity Team at firstname.lastname@example.org.
The preferred way of contributing is through Git. If you know how to work with Git, be sure to check out Vanity's page on Gitorious, clone the repository, and submit a pull request when you're done.
If you don't know how to work with Git, download the latest snapshot of the Vanity code. Do your thing, and when done, report a bug (it's not really a bug, but still) with your code attached.
If you have a request for a specific feature, or have found something that doesn't work (anymore), it would be much appreciated if you reported it in the Vanity bug tracker. If you have a request for a specific service to be supported, please add the tag site-request.