Okay, I didn't mean EVERYone was in an LDR, but the majority of "Enduring the Distance" posters...
I'm a little surprised (yet not) that the vast majority of people would simply kick him/her to the curb. For me, it's more the issue of trust than the cheating itself - we also had an informal "if you going to do it, at least have the dignity to tell me" agreement, but when it comes down to it, the odds of getting told that your SO is cheating is slim when they think they can cover up, no messes.
What if you made the decision to forgive them or at least attempt to work through it. Would you hold it in and wait until you were SD so you could talk about face-to-face or confront the issue now, knowing there's the possbility that may break up the relationship (especially if they found you got the info through covert means). But I guess that's a dumb question, because if they break up with YOU because you found out they cheated, that relationship was dead anyway.
It's not easy. For me, I would think that the reason they cheated was because they had needs to be fulfilled that I couldn't do from 5000 miles away and that as soon as we were together again, that would stop (especialy if you had never had fidelity issues while together). In that case, would you still kick him out? It's by no means an excuse, but...oh forget it, I can't rationalise this one.

This thread is interesting.