One of my favorite sites, Uncov (filling the vacant hole left when Go Flock Yourself packed up and went home), made this great observation in a recent write up of theirs:
With Web 2.0, you can take an IFrame and seven callbacks and call it a platform.
In a conversation in the past week or two, I was actually making this exact same point about the term platform. It's officially reached buzzword status. Like any good buzzword, it now has zero meaning.