It will be posted there before anywhere else. right now there is not but be sure to READ the top post on that page before you do anything! It states very clearly that the current release does NOT support the 3G iPod.
Haven't been keeping up with the unlock situation as I'm with AT&T, but had a client ask if the 2G and 3G are currently unlockable on 3.1? Apologies if this has been asked.
Yes as long as they haven't been updated to 3.1 already and I'm not sure there's a full proof method of downgrading. I don't pay much attention to 3G or prior as I only have a 3GS but the dev-team blog has all the information on this.
Yes it did very quickly too but I'm wondering if the new pwnage tool is better. Devteam is very particular about makig sure their solutions work on every device flawlessly.