Just for general typing, I have found Multikey very helpful. It has everything the user could want for a polytonic unicode Greek font, and lots of other stuff besides. Some of the keyboard assignments are a bit idiosyncratic, but hey, what's not? I can only speak to the Greek at this point – I've never really used any of the other fonts, including the Hebrew.
N.E. Barry Hofstetter, M.A., Th.M.
Ph.D. Student U of FL
Instructor of Latin
Jack M. Barrack Hebrew Academy
καὶ σὺ τὸ σὸν ποιήσεις κἀγὼ τὸ ἐμόν. ἆρον τὸ σὸν καὶ ὕπαγε.
I've found this service to be brilliant (though slow on more than a few thousand characters). It follows normal betacode characters. More importantly, since I don't use Windows or Apple, it is nicely platform-independent.
The script is licensed under creative commons, so I've made a JQuery version; I can send a copy to anyone who would find it useful for their web projects.
"When eras die their legacies are left to strange police." -- Clarence Day
Nigel Chapman | http://chapman.id.au