What do you really want from jailbreaking? There really aren't that many great apps any more. The only things I could find that were even somewhat worth the effort were customization apps (MIM, Customize, Winterboard) and a few preferences apps. If you don't really want these, it is not really worth the effort. I jailbroke one night, and by morning, I had decided to restore back to stock firmware because it did not work well for me. Plus, I find the App store Apps to be of a higher quality than even the pre 2.0 jailbreak apps. And no, I didn't find a use for Installer, as Cydia has most of the good apps anyway, so you can install it, but I don't think it's really going anywhere fast (It looks as though Cydia has taken over)