Of course, we all know that there are a lot of theories about the Othismos. What it is, how it actually works, and how did it play-out "for real". Of course, we may never know for sure but this guy has some interesting ideas and demonstrates them a bit as well.
There is also a video about Over-hand versus Under-hand debate for using the Hoplite spear. May want to check that out too, if you are interested in Greek warfare.