"The Traveller by John Twelve Hawks. Very good so far (about 100 pages in. Nice idea about Travellers (who can shift between dimensions), Pathfinders (who teach Travellers), Harlequins (who protect Travellers) and the Tabula (who run the Vast Machine, i.e. the "normal world", and want to kill all Travellers etc).
Also, Super Freakanomics. Previously read Freakanomics so expecting more of the lateral thinking brilliance that the first book provided.
I also listen to a lot audio books during my commute. Just finished the excellent "The Lost Fleet" series by Jack Campbell and have now moved onto "Destroyermen" By Taylor Andersen.