First off, sorry that the bouldering history link from a few days ago was bogus. I fixed it.
Climbing icebergs looks pretty cool! Scary, but cool. Here are two different sources of info for climbing these things:
First we’ve got a clip from Will Gadd’s video “Aweberg” (which I think is a hilarious name!) about climbing icebergs:
Also, here’s a more recent article on the NG Adventure blog about climbing icebergs.