The list of possible new features and bugs at https://github.com/bitcoin/bitcoin/issues is getting longer every day; I'd like to see the bugs resolved before the bug list gets so long we all just start ignoring it.
So: who is willing and able to help out? Don't ask permission, just jump in, grab a bug that catches your interest, add comments to it as you start to figure out what the problem is (or isn't), and submit a PULL request when you have a fix.
Your reward will be recognition, admiration and respect. It is time to take bitcoin from, essentially, a single-programmer project to a robust open source project with lots of contributors.