Open WebKit
Amid all the kerfuffle about Apple moving to Intel processors, one important piece of news got underplayed. WebKit1, the system framework used by Safari (and other MacOSX applications), is now open-source. This is great news, as it means faster bug fixes and greater community involvement in the development of Apple’s flagship browser.
And, yes, there is a plan to implement MathML in WebKit (whose progress can be followed here).
If this actually comes to fruition, I may finally have to dump Mozilla …
1 WebCore, based on KHTML, was open-source from the start. WebKit provides a higher-level API and contains a lot of functionality not in WebCore/KHTML.