The HTC EVO received a bug fix update right at launch and another one has been discovered. It's been told that a software problem for screen responsive problems is coming. Also the WiFi singnal strength might be tweaked also.
Engadget has been told that the issue involving the screen slightly separating is a cosmetic problem and shouldn't interfere with the phone itself. Instances of this are not widespread and that HTC is fixing the phone to make sure this won't occur again in the future. We think this is a pretty good response to the updates the phone has had to receive.