Shoutbox

Hello, I know you'll all think me really, really, really stupid, but I was just reading this thread and was wondering if I could try out the latest build too.  How do I do that?  and is there anything really bad I should know about it if I am going to try it?  You see my system is a little unstable at the moment anyway, still managable though.

Anyway, if someone could direct me as to downloading the latest build would be good.

Thanks.