I also think that Desiring God would be a candidate. It is being used by God to bring droves of Christians to hold an at least semi-reformed theology by introducing them to the doctrine of predestination and acting as an intro to other works by "pop" Reformed/Calvinistic guys such as Sproul, Mahaney, Grudem, and of course Piper. I know that many college students are exposed to this genre through the Passion conferences.

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DAVIDIVS DOCTVS VTRIVSQVE LINGVAE
Husband of Emilia
Member: First Reformed Presbyterian Church of Durham (RPCNA) - Durham, NC
Currently in the process of transferring membership to an as-yet-undecided church in Chapel Hill
Student: University of North Carolina at Chapel Hill, German Literature and Classics