For the most part, I was visiting the Dev Team's unofficial blog a few times a day over at http://blog.iphone-dev.org . For updates to their app, I just enabled Auto Update when prompted the first time I launched Pwnage.
As far as other builds are concerned, i.e. ZiPhone or something by GeoHotz, I just check the usual places, mmi, jaib, and ia.
Pwnage is pretty simple, and since its done through iTunes, its probably going to be my only means for a JB.
Theres no word yet on a WinPwn version, if you're on PC (I don't recall), but people have been finding ways around that with a precompiled custom firmware and the older version of winpwn.
On a side note, you're not missing anything. After having a go with this a few times, the only thing I have to say for it all is my NES back. That probably wont be much reason for most people to jump ship and JB just yet, but for me its one of my most frequented apps, so I found the risk worth it for now.