I ride on Pfanensteil every now and again, I ride up from the Uster side but the best trails are down the Meilen/Kussnacht side. If your interested get in touch with me through the forum.
We will also start doing an English Forum MTB meet to ride Uetliberg or Zuriberg on tuesday evenings starting as soon as the evening are long enough. Probably the start of April. We had some good turn outs last year and it looks like this year could be even better.
Sorry for the delay in the reply, was away for a while. I would like to join the Tuesday evening rides when they start happening. It sounds great, and I would love to learn more trails around Zürich. I got a single trail map when I first arrived here, but I never seem to get where I want to go with it. (Maybe its me, but I think it has a lack of detail!)
I will also need to work on the fitness!!! Had way to many chocolates this winter :-)
And if you ever go up Pfanensteil let me know, if I`m free I will join you. I have been up there a few times and its a great ride.