First off, if you haven’t tried Minecraft yet, it is a ridiculously addictive game in which you, the player, dig tunnels, collect materials, craft items, and build up the world around you. You explore underground caverns, build houses, castles, farms, etc. It’s a ton of fun (and definitely a good way to waste hours of your life). If you haven’t seen it before, check it out.
I run a Minecraft server for a few friends of mine, and even if I wasn’t in the game, I wanted to be able to chat with them and run server comands on the go. So I wrote a VERY quick and extremely dirty (and buggy) Minecraft chat client for the Blackberry that will connect to a server, and let you chat and run commands.
It has a few limitations – specifically that it will only connect to a server that has minecraft.net authentication turned off. It wouldn’t be too difficult to insert this functionality into it, but I banged this out in a couple days and don’t really have time to put any polish on it.
UPDATE: BerryCraft can be downloaded here.