The Mozilla Foundation may have officially abandoned (apart from the 1.7 branch) the Mozilla Suite (codename Seamonkey), but the browser that started it all off still lives, thanks to a community effort, including some fairly big names in the Mozilla hacking community, led by the new Seamonkey Drivers, and with an impresive list of names on the supports page. Key backend hacker bz (is it worrying when you start recognising people by their Bugzilla logins?) isn't on that page, but given that he drafted the open letter to the Mozilla Foundation regarding Seamonkey, I think that he remains committed to some degree.
Now that I've got that off my chest, why do I feel the need to put fingers to keyboard? Mainly because I don't like Firefox, and I do like the classic Mozilla suite, so I'm glad that it's going to continue to be actively developed. Don't get me wrong, if it's choice between Firefox and IE, it's not really a choice (hmm, a layout engine that hasn't been updated significantly in three or more years, or a modern standards-compliant engine that almost fully implements the CSS2 spec), but in terms of Gecko-based browsers, Seamonkey wins every time. I can't pin my dislike of Firefox down to any one thing, but a combination of factors adds up, with my preference for the Seamonkey UI outweighing the FF one, and a greater number of prefs available without having to resort to about:config being the most important two.