This is book that Jess has lying on the counter – the first volume of Dante’s Divine Comedy, previously discussed. It’s a Penguin Classics edition.
Rory has already been identified as reading this book, so it’s very likely she has recommended it to Jess, or even lent it to him. Jess said he didn’t like poetry, yet here he is reading a book which is entirely in verse!
The Annotated Gilmore Girls 
Yeah, that whole “can’t get into poetry, just say it already” comment doesn’t really track with the rest of Jess’s portrayal. Unless he constantly reads stuff he doesn’t like. 🙂
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