I bought Skyrim at Christmas and for a while I was playing it non-stop. Really killed my writing time, but an absolutely fun, enjoyable, addictive game to play.
Sometimes the side quests are better than the main quest line. Get a list of about three or four side quests and then just tour the country with your follower and complete all these side quests. It's good fun. The Companions quest line is good, but you have to also do the Thieves Guild and the Dark Brotherhood quest lines, too. Way more fun than the main quest line.
What is also cool is while doing a quest, a random dragon could spawn and you'll end up running around the place trying to kill it before you can return to your original quest.
I haven't played Skyrim for about three weeks (deliberately trying not to, in order to get some novel work done), but I might just have to return to the game soon . . . one weekend.