If you know how to use the advanced CLI, you will be able to jailbreak your iPhone 4S and iPad on your Windows computer! Details from the iPhone Dev Team blog:
The OS X version of the CLI mentioned in the post can be downloaded here. It’s primarily to help us debug specific issues, but tinkerers might like to play around with some of its advanced options! More info is here.
- Version 0.4.3 adds support for Windows users. It also makes the “-j” jailbreak option much more functional See the README.txt for usage.
GreenPois0n Absinthe 0.1.2-2 is currently for OS X only. We can expect Windows versions of these jailbreak tools to be released anytime now.