For a variety of reasons, a scaleable (cached) graphing capability would be nice to have in a MediaWiki extension for Wikimedia wikis. This would allow us to have pretty graphs of edits over time at [[Special:Contributions]] or have pretty graphs of edits over time at the info action or whatever.
It'd also be helpful to be able to have graphs in articles. This is somewhat different, but could use the same graphing library, presumably. This bug tracks graphs generally on Wikimedia wikis.