As one who has been teaching himself Greek for far too long... 
I'd like to post a resource that I came across that seems to be useful.
It's a set of online flash videos by Ted Hildebrandt, teaching the basics of Koine Greek.
It's interesting and in my mind, worth going through. For those who know this stuff it will be a snooze fest....
http://faculty.gordon.edu/hu/bi/Ted_Hildebrandt/New_Testament_Greek/Video/00-GTLearnVideos.html