[Koha] Getting a newer version of Koha

(Koha 3.0alpha, (Gentoo) Linux 2.6.24, MySQL 5.0.56) I've seen some terms thrown around like "latest snapshot", "git" and such that seems to indicate it's possible to get a newer version of Koha than 3.0alpha. I found my way to http://git.koha.org/cgi-bin/gitweb.cgi?p=Koha;a=summary , but I'm not sure what to do there. Clicking on any of the links labeled "snapshot" seems to trigger a really big download, though. So, to get the latest version of Koha, should I just download the top "snapshot" link? Or is there a better way to do it? (Is there a revised release date for the beta, BTW?) Thank you.