Full marks for getting this visibility in the App store - 1000 of the greatest poems make tasty short form content for the ADHD crowd to consume in an idle minute of service downtime. Personally I have always wondered why they choose such odd poems to feature on the subway when the classics still don't get much airplay. These are all public domain of course, so no royalties to pay and at $1.99 to download I hope the publishers can make some money out of this. No doubt you can source it all free online but I'm heavily on the side of the Convenience Economists and reckon this app will help to prove them right.
On the endorsement side, literature generally makes a pleasant bedfellow for brands across the board. Poetry resonates especially well with the bon vivant, fancy-liquor-swilling, amex-waving set. Wouldn't it be grand if this app, to compliment its basic search architecture, had some additional back-story or criticism c/o of some high end marketing channel? Geniuses they may be but frankly it's hard to follow what most poets are rattling on about half the time, and a little friendly explanation to the non-professorial classes could warrant the discrete insertion of a logo here and there, IMHO. As to the design, they've opted for the sepia/walnut dash look which obviously evokes the period, but this can have the same cloying effect as those phony antiques in over-priced New England flea markets. For those who prefer to keep their classics current, a few alternative designs would be nice to choose from, again an opportunity for a sponsor to add some value into the mix. But all in all, a simple idea, well executed. Now that's what I call poetry.