Finally a root for the Samsung Galaxy S I9000 JPH firmware that doesn't involve a fair number of reboots, flashes and battery pulls. One single ODIN PDA flash of a few megabytes and JPH is rooted. It also comes with Superuser and BusyBox, and downgrades to "2e" recovery, so you can flash update.zip's again without those pesky signature verification problems. Finally, it also includes a fix that makes ClockworkMod work :) Hurrah!

The XDA-Developers thread can be found here.