Both limera1n and also greenpois0n have been released, but the big question on everyone's lips is: which jailbreak solution should I use for my terminal? The 2 jailbreak solutions are essentially based on exactly the same exploits, i.e. an exploit discovered by geohot 6 months ago plus another one by comex which combined with the first one leads to an untethered jailbreak. From a peaceful point of view, you have nothing to worry about because both work on approximately the same "skeleton". The implementation of the 2 exploits is definitely different for each individual jailbreak solution and it is hard to say which one causes the least problems.
I used both limera1n and greenpois0n (for a few hours) and I did not encounter any noticeable difference in the use of the phone regardless of which solution it was jailbroken with. I encountered no problems installing/using applications, using GPS or connecting to the Internet, practically everything works equally well on either of the 2 solutions. Both have afc2 integrated, so you will have access to the phone's system files via USB immediately after the jailbreak, so this does not separate them either. The only notable differences could be related to battery autonomy and phone performance. I can't tell you anything about the autonomy yet because both are too new and regarding the performances I really don't have any clue to separate them.
You can use either of these 2 jailbreak solutions because both will work equally well. The problem with greenpois0n is that it ONLY works on iOS 4.1 while limera1n works on any version of iOS between 4.0 – 4.1 but does not work on any version of Windows. Each has its little quirks, but both are equally well done.
