Hi! The Planescape site is currently down for technical reasons. Despite this, work is being done to create an official conversion. Ashy could tell you more...
A 3e version of the setting, similar to what they're doing at Athas.org is currently in the works at Planewalker.com (which is currently down due to server problems).
If I may say so, my fan site is also worth checking out. See my sig for details.
