DigiSEO - 11:18 pm on Jan 13, 2011 (gmt 0)
A quick check shows me that they have NOT gained a lot of backlinks this past year - so we can probably rule out that factor. While they didn't increase total backlinks very much, they did gain some new backlinks from domains that never linked to them before, around October 2010. That could be a factor.
Tedster, I'm curious how you go about finding this kind of information (links over time). I would like to do this for my sites and competitors' sites.