I have seen that this is not suppose to work. After messing up earlier today, I ended up with restoring my phone. I did it throug iTunes, which also pulled in the newest firmware.

I activated it with iactivate and proceeded to jailbreak it and installed ssh.

Now, my iPhone is still jailbroken and I sync with iTunes with no problems at all... Should that not have been possible? Can something go wrong with this setup. It's actually really nice to "not have to jailbreak and rejail" all the time...