Devil's Advocate - Green Poison just came out - it is SUPPOSED to JB everything
I use
http://www.redmondpie.com for all my Jailbreaking news/links.
FWIW - limerain to me just seemed rushed so he (Geohot) could get it out before Green Poison came out to get all the credit - I would assume that Green Poison is a little more polished and reliable. Plus they delayed the release after limerain came out to integrate the limerain stuff into it.