Interestingly enough, I don't have the MLB, NFL or NBA apps.
I have ESPN, Yahoo Sports, CBS Sports and Fox Sports.
Since we're not getting the Rays on TV, I like ESPN's game tracker for baseball. I like how Fox lays out & explains the odds & the lines. Yahoo has convenient notifications and it tracks my fantasy players too. CBS and ESPN do the best job of covering the WNBA.
I could probably stand to cut back on some of the notifications I get from them though.
What apps do you guys use and what do you like or dislike about them?