Great free traffic app- INRIX
Until Nokia update the Drive app, knowing what the traffic is doing before you choose route A or route B can be a lifesaver, this is where INRIX comes by showing the traffic conditions on major routes, it has saved my bacon on the M6 many a time.
Even better still it is the great price of free!!!
Coincidentally this whole post, images and all was created on the WordPress WP7 app which I will cover this weekend.