Here is what a Digg Effect looks like for your traffic:
Google Analytics Graph:
Obviously there was a huge spike when the site hit the front page of digg. After that it decayed exponentially, and now the traffic is pretty much where it was before. I imagine it's pretty much the same for most sites that make digg... a huge influx of traffic; people think "hmmm, that's cool"; maybe make a comment; then move on...
...which is fine with me, I was just happy for the exposure :-)