As if getting a Kindle for reporting bugs and getting an AppleTV for filing a survey aren't enough, you can also win an iPad for fixing an issue.
So if you've been thinking about tinkering with Jenkins code base but haven't done so yet, this is a great opportunity to get going. There's documentation about how to get started, and there's Jenkins Office Hours and IRC channel if you need some interactive help from existing devs. I think new features, not just bug fixes, would qualify, so long as it's recorded in the issue tracker. And similarly, I think the plugins would qualify, not just core.
Aside from iPad, there's one $50 Amazon gift certificate going out every week, which is almost a steal! So be sure to submit your entry!