I blogged the other day on Hendrickson Publisher's upcoming book, A Patristic Greek Reader (amazon.com). It sounds very good, but it isn't published yet (the date is sometime in September 2007, as I recall).
In lieu of that, I thought I'd blog about some other readers that are on my shelf. I haven't actually made it through these, though I have slogged through some portions of them.
1. Hellenistic Greek Texts (amazon.com) by Allen Wikgren. This was published by the University of Chicago Press in 1947, but still appears to be in print. The copy I have (purchased used and given to me as a Christmas gift by my mother- and father-in-law) is in good shape. The manuscript is typewritten. It is 290 pages; the back 65 pages are a glossary with very brief definitions. Selections from LXX, NT, Apocrypha, Pseudepigrapha, Philo, Josephus, Apostolic Fathers, other early Fathers, some Papyri and some other pagan Hellenistic literature. Recommended particularly if you'd like to broaden your horizons but only buy one book. Also, you can (without too much trouble) find English translations of most of these works, though the text itself has no translations.
2. A Greek Papyrus Reader with Vocabulary by Edgar J. Goodspeed and Ernest Cadman Colwell. This as well was published by the University of Chicago Press in 1935 with a second printing in 1936. But it doesn't appear to still be in print. As the title says, the focus is on papyrus. There are 82 papyri within the 108 pages of the book. Each papyrus has a brief intro and some notes at the foot. At the back are 20+ pages of vocabulary (a gloss list, essentially). The primary issue with this slim volume is that there are no translations, and it is difficult to find translations to check your work, so you're left wondering if you've got the gist of everything correctly.
3. While not technically "readers", I can recommend two diglot editions of the Apostolic Fathers: Michael Holmes' third edition (amazon.com), to be published in November -- though my primary experience is with the second edition; and Bart Ehrman's two-volume Loeb edition (Vol I (amazon.com), Vol II (amazon.com)). In my experience, Ehrman is more idiomatic and Holmes is more literal, so you take your pick. These have translations but no glossary/vocabulary sections.
Any other readers out there anyone would like to add to the list?