One issue that has come up again and again during my two years of running Veeptopus is the proper pluralization of octopus.
Like a lot of you, I originally thought that the correct plural for our favorite eight-legged cephalopod was "octopi." Then my friend who has a PhD in Classics - the sort of guy who used to read Aramaic for fun - informed me that while the word "octopus" is a Greek word but that the "pi" pluralization is Latin. Therefore "octopi" is, for linguistic purists like him, silly. I found his argument to be compelling. So these days, I use the good old fashioned Anglo-Saxon form "octopuses." The word might not be as mellifluous as "octopi" but it feels more honest, more straightforward and more correct. Of course, if I wanted to be really hardcore about it, I would use the Greek pluralization "octopodes," but I'd probably get a lot of funny looks.
Below, someone far more articulate and knowledgeable than me expounds on the subject.