Initially I had some difficulty with the forum using Windows Phone 8's built in Internet explorer on my Nokia Lumia 920.
I could not get the Forum link on the Support tab of the menu bar to take me to the forums.
Now, I do this:
1 Goto www.arduino.cc
2 Goto the address bar and manually type forum.arduino.cc
3 Enjoy trouble free forum participation without the 'token' headaches I receive on my desktop.
Hope that helps someone. The 920 has a 1280x768 resolution. In landscape mode the forums are very readable.