I wonder why the antiquated spionic greek posting method is used here? I can just press ctrl+shift+3 and type in the accented greek with “polytonic greek” standard Win2k input method .. I think it also should present in any other decent Windows. Any other modern OS also should have a way to create unicode texts.
I personally have two problems with spionic - 1. it must be installed. That’s pretty minor, but the other one is worse - 2. the only known SPionic font looks UGLY to me. I personally would prefer even not the greatest polytonic greek glyphs that present in the standard Windows universal unicode fonts, Palatino Linotype and MS Arial Unicode… But with spionic, there is no even hope for any choise at all, ever 
I understand that there may be people who won’t want the change, though. Why then not to make a flexible system like that of perseus project - there, one can choose if he wants the unicode or some other greek representation method, including spionic. So one would choose what he will use to post the greek text - spionic or the utf8, and then the board would automatically convert this input to the internal representation and give it to everyone in the correct format.
There may be even simplier solution - leave the input only as spionic, but do the utf8 translation of pages shown if requested - thus the user will be able to choose font he likes to represent greek. Perhaps this translation should be the default even, because any new user of Textkit probably does not yet have the SPionic installed, while the chances that he has modern web browser that supports unicode are much better. Thus the chances that the new user will see correct greek right away will improve against the current situation, which IMHO is a good thing.