CTAN has a new package: GFS Didot
Greek Font Society, Didot fonts (including Olga font for italic). Supported by the Laboratory of Digital Typography and Mathematical Software, of the Department of Mathematics of the University of the Aegean, Greece.
This package is located at http://tug.ctan.org/tex-archive/fonts/greek/GFS/GFSDidot . More information is at http://tug.ctan.org/cgi-bin/ctanPackageInformation.py?id=gfsdidot (if the package is new it may take a day for that information to appear). We are supported by the TeX Users Group http://www.tug.org . Please join a users group; see http://www.tug.org/usergroups.html .
GFS Didot – A Greek font based on Didot’s work
The design of Didot’s 1805 Greek typeface was influenced by the neoclassical ideals of the late 18th century. The font was brought to Greece at the time of the 1821 Greek Revolution, by Didot’s son, and was very widely used. The present version is provided by the Greek Font Society.
The font supports the Greek alphabet, and is accompanied by a matching Latin alphabet based on Zapf’s Palatino. LaTeX support is provided, using the OT1, T1, TS1, and LGR encodings.
The Greek Font Society
George D. Matthiopoulos