I know that the Patrologia-Curcus-Completus is still languishing in Pre-pub http://www.logos.com/product/4346/patrologia-cursus-completus-series-graeca-part-1 which is a great pity, but from my point of view it would be helpful to have more Greek texts ... searching for relatively obscure language constructs becomes more meaningful the larger one's database of texts one can search. Plus many of the classical Greek and Latin texts are generally referenced in contemporary New Testament scholarship.
What I would really like to see is Greek-English versions of the classics, ... the Philosophers, Playwrights; Historians and Poets, etc of ancient Greece are often quoted and searched for parallels to the NT/LXX.
It would especially be nice to have: Homer (I know we've already got the Illiad); Heraclitus; Herodotus; Sophocles; Thucydidies; Euripides; Aristophanes, Plato; and Aristotle;
I guess it would be good to have the Latin writers too, you know: Cato; Cicero; Virgil; Horace; Seneca; Ovid; Pliny; Tacitus; Juvenal.
Obviously interlinears would be nice (but in the interest of speed) I would settle for the original language and the English translation in two synchronisable resources.
The good thing would be that there wouldn't be too much tagging to do for these resources. They could be put into production very quickly and cheaply.