So, uh, how's Planescape going? 
Most probably wont remember me, although taking a look at the equipment section of Snail Outfitters'll show a lot of 3e items there from me (ie by Christopher Allen - most were simple conversions of Planescape Torment items that I did en masse for one of my own campaigns). I more or less completely ceased to play any D&D related games in recent times, mostly due to a lot of d20 burnout after working as an editor at Mongoose Publishing for 14 months (when it's your job as well as your hobby, gaming can stop being fun 
) and after my laptop dying on me nuked most of a 3.5 supplement I was writing (if Ashy sees this, it was the Biothaumaturgist's Handbook).
Today though, my meandering path across the internet brought me back here again, along with an increasing hankering to play some sort of Planescapey things again. I've been putting together my own planar setting but sometimes there's just that need for the good old days of wandering Sigil and the Outer Planes; I'm also tangling with what kind of system I'd want to run it with these days.
So I thought I'd pop in and see how things are going with Planewalker, how you all are and if the future holds anything interesting for PS.
Also to check out whether Planescape has had much more integration into the more recent 3.5e products, as I havent been following them very closely for a while now. Apart from the Manual of the Planes, have WotC put out any other new product covering Planescape material that are worth checking up on?
Hi.
The Planar Handbook gives prestige classes and short descriptions of many of the factions (and a few Planescape monsters, like the balaena, nic'Epona, and unraveler under different names, and fairly good descriptions of Sigil, Tu'narath, and the City of Brass). It represents something of a wasted opportunity, though, not giving enough information on anything to sell the ideas to those not already accustomed to them. Complete Scoundrel will have the Free League detailed as an organization.
Fiend Folio has a lot of Planescape monsters in it.
Fiendish Codex I: Hordes of the Abyss mentions a number of Planescape factions and adheres rather closely to - and greatly expands upon - the descriptions of the Abyss in Planes of Chaos.
Fiendish Codex II: Tyrants of the Nine Hells is much less Planescapey, contradicting Planescape on several levels, but still usable.