In a message dated 2/22/2011 10:16:25 PM Pacific Standard Time, sjklein@hcs.harvard.edu writes:

There's a shortage of core developers. There are quite a lot of PHP developers who have built some sort of MediaWiki extension, or otherwise hacked on it to make their own fork, however. We have some opportunities here to recruit more of them as well -- some way of encouraging each downloader to get involved, or one-click sharing of their local hacks with a global community? I'm not sure; but this is certainly another case of "how can we embrace people who take the first step to join us" worth solving.

AdSense Integration. The ability for a MediaWiki install (retroactive to earlier releases) to stick Adsense ads in where they want.