I'm grateful to Sarah Madden for alerting me to a fine new site for working with the Greek New Testament and Septuagint:
Greek Bible Study
Anonymous site. Excellent, colour-coded Greek New Testament (Tischendorf) and Septuagint, with mouse-over Thayer word definitions (long and short), word studies, notes facilities and more. Unicode fonts, good search facilities, and a graduated reader based on William Mounce's Basics of Biblical Greek.
I've added a link high up on my Greek New Testament Texts (test) page since those pages will soon be integrated into the site. (More soon).