I think what's really funny is that I have my character up to level 50 and never bothered getting up to the top of that mountain yet. Literally I think the main quest is the only one I haven't done yet...
...well, and the brotherhood.
But I think this is a case of getting so wrapped up with other quests and guilds that I totally forgot about the main quest.
Remind me never to go to your open house event.