In the last year insiders have purchased 4,000 shares... to me that's not a great sign of confidence.
That said, I bought in earlier this year and needless to say I'm underwater.
Including FlyerTalk, I think IB has a great collection of assets that are far from being fully utilized, let alone reaching cost efficiencies of putting them all on the same platform.
As unpopular as recent moves like OMNI access are, they are good for generating clicks, which sells advertising. Hopefully IB can continue to drive traffic and CPM increases in the tough economy. If you think so, now may be a good time to buy.