I have heard of Absinthe but I have not personally used it. I have always used RedSn0w however and that has always seemed to work. Try and follow this tutorial
You must login or register to view this content. and let me know how it goes. It should be super easy and all the links are direct from that page.
---------- Post added at 10:45 AM ---------- Previous post was at 10:28 AM ----------
There is a slightly newer redsn0w than the one in the tutorial above but it is mainly for iPhone 3g/3gs users but you can update it if you want. Here is the direct link from the website:
You must login or register to view this content. (Windows -
Must Use As Admin)
You must login or register to view this content. (OSX)