Last time a new firmware update came along I installed it and I had to re-jailbreak my iPhone. Is there a way to update to the latest firmware and keep the iPhone jailbroken?
Unfortunately once you jailbreak it you are stuck with that firmware I believe. If you want to keep up-to-date with the latest firmware you'll probably have to restore factory settings to your iphone and update it then wait for someone to come up with a jailbreak for that specific firmware.