I've been stuck with the desktop version in Firefox on my SGS2 since July, it is such a pain. It was discussed a little
here, but not resolved (looking back I don't appear to have responded to all of Timan's posts though, perhaps I could have put more effort in on my end, I must have been busy or something

).
I've just tried Google Chrome and the default browser, and they work perfectly.
On Firefox (which is what I normally like to use on android btw), I've just gone to settings > clear private data, left everything ticked, and clicked 'clear data'. But browsing to the forum still shows the desktop version. I tried loading a different website in a new tab, and closing all neowin tabs, repeating the clear private data routine, closing Firefox (including closing through the recent apps list), reloaded, and still, loading the forum gives me the desktop version. Whether I login or not makes no difference. Something's borked
Edit: and just to clarify two points, 1) the neowin home page is the mobile version, it's only the forum that is the desktop version, and 2) having given me the desktop version, clicking the 'view mobile version' link just takes me to the home page, and from that going back to the forum again, the forum is still in desktop mode.