Hey, talking about nexball?
As esteel said, I feel the code is just not ready yet for inclusion... I'll wait for the 2.5 release and then maybe ask for merging the beta 2 (which is "planned" for release around 2.5's release, using the stable codebase) into the trunk.
Most of the nexball code is located in an independant file, to avoid scattering it around and to "quarantine" my silliness (I believe it is not really optimized). But I designed it to be mergeable: it works like any other game mode, it does not interfere with anything, so it's more of an addition than a modification.
Don't worry, I'm still maintaining it, even though I do it silently. It's synced with the trunk, not dying

I still have a few things on my TODO list, I just need some free time to get them done.
Sorry tundra, but there won't be any nexball in 2.5. This is why I'll be releasing a beta based on 2.5's code. Then you can put it over 2.5 and it will work exactly the same, except for that new gamemode.