Andrew T.
Yelp
You really need to be a ski buff to appreciate this. I personally have never skied, so it didn't really resonate with me. It seemed well presented, with information on the history of skiing, etc, but the main reason I came here was just to get out of the city a little bit, take in the view from the top of the jump, and just see the jump myself.
Now, my SAS inflight magazine on the way over called out a zip line that had been installed at the jump. Sounds awesome. But it also listed a price of 1400 Euro, minimum group of 4 people! Now, maybe that's just old information, but the price when I went is actually 595 NOK, and you just walk up there, pay your money, and take the plunge. And after waiting for the elevator to get up (there's only one, it's not that big, and lots of people want to go up) this is a much better way to get down. Lots of fun, and the view of the city as you're racing through the air is probably one of the better views you're going to get. It was also fun to watch the employees "play" - I seriously think that in order to send a chocolate bar down from the top of the tower to where the "landing crew" were positioned, a girl was strapped in so she could ride down suspended from her back - more of a superman pose than a parachute harness position. And how did she get back up? The strapped her in so she was hanging upside down and backwards. Hey - when you have a zip line at your disposal, I suppose traditional methods get old after a while.
So - if you ski, come for the Ski Museum. If you just want to get out and grab a little fresh air, come for the view of Oslo from the top, and the slightly calf busting uphill hike from the T-Bane station. And finally, if you're awesome (like me), come for the zip line. Admission to the museum and jump tower, which is a bit pricey at something like 110 NOK, is covered by your Oslo Pass.