If you put ironworks in a search engine it brings up a list of all the Forums one of them PST but there isn't one here. What happened to it.

No you're right. We don't have a PST forum.
I have often thought it would be nice to have a forum for 'other PC games' (I don't think PST by itself would generate much traffic, it is quite an old game now).

But take into account that Ziroc and the mods are kept pretty busy running the other forums here, and with real life issues too, add to that the lack of server space - and it might not be feasible right now.

I would definitely post to such a forum sometime were one to be added in the future - but it is up to Ziroc - he runs this place out of goodwill, using his own funds, time and some donations (and does a bloomin' good job too).

You can post PST queries here in General Discussions, I see no problem with that, and quite a few people here have played it.

Daniel, there is quite a good Planescape: Torment Forum over on the Black Isle Forum. Otherwise, like Epona said.