Apple launched today two updates, one for the iPhone (4.0.1) and the other one for the iPad (3.2.1). It seems that these updates are patching the exploits used for jailbreak, so the guys who are working on these solutions are telling everybody who need jailbreak and unlock to stay away from these updates.
The only thing that the update does on the iPhone is to fix the signal issues (or at least, this is what Apple says). It is not confirmed if this fixes the issues or not (however, it seems that Apple silently recalled the iPhone, because many people who got their phone replaced are no longer complaining about the signal issues). I didn't find out yet what the update exactly does one the iPad.
I just warned you about what these updates do, but I won't offer you solutions for jailbreak at all. If you need, search on a dedicated website for something like this.