I just received the following two books from Amazon:
The two books differ greatly from each other in both content and format.
Most of the selections in KOINE GREEK READER (KGR) by Rodney J. Decker ($17.15 at Amazon) are from the Bible, whether the Greek New Testament (for which there are not translations) or the Septuagint Old Testament (with translations). The book also includes short selections from Ignatius, the Didache, 1 Clement, and the Shepherd of Hermas, as well as four Creeds (the Nicene, Nicene-Constantinopolitan, Chalcedonian, and Apostles'), also with translations. All the selections, other than the Creeds, have supplemental readings, too, though these just have parallel translations and not vocabulary and grammatical notes. The New Testament selections begin with grammar reviews and vocabulary previews, and include recommended readings from various grammars, most of which the student should own or plan on owning, or at least have access to. KGR also includes several Appendices with helpful word lists and verbal charts and information, as well as Decker's essay on using BDAG (the Bauer-Danker-Arndt-Gingrich Lexicon), an earlier version of which is accessible from Decker's Website.
A Patristic GREEK READER (PGR) by Rodney A. Whitacre ($19.77 at Amazon) includes selections from the Didache, 1 Clement, Ignatius, the Epistle to Diognetus, the Martyrdom of Polycarp, Justin Martyr, Melito of Sardis, Clement of Alexandria, Eusebius, Athanasius, Gregory of Nazianzus, the Desert Fathers and Mothers, John Chrysostom, Hesychios the Priest, and Symeon the New Theologian, and includes translations of all texts. There is introductory and historical information for each selection, with extensive running lexical and grammatical notes under the text. A separate section in the book contains translations of all the texts. There are three brief Appendices: Appendix A - All words that occur 50x or more in the New Testament (i.e., the words the reader should already know); Appendix B - Principal Parts of Common Verbs; and Appendix C - The Selections Arranged in Order of Difficulty.
PGR is more of a straight reader, whereas KGR also incorporates aspects of a grammar workbook. The books are relatively inexpensive, so the student who is interested in increasing his proficiency in New Testament Greek and/or expanding his reading beyond the New Testament texts should consider buying both of them.