Just read that WOTC is going to shut down their forums on October 29.
As the Planescape subsection includes many conversions of Planescape monsters for 3.5 Ed. I'd recommend everybody still playing 3rd Ed. to save a copy of them for otherwise they will be lost thereafter.
We encourage past and current users to retrieve any information you want to retain from the Community Forums for both Dungeons & Dragons and Magic: The Gathering. The shutdown will occur on October 29, 2015, at 10:00 a.m. PT. We want to provide enough time for our forum members to move their content, and we recognize that given our forum's vibrant user base and extensive history, this may take time. Any information still on the forums on the cut-off date will be deleted.