I got my new computer this week, and it's super. I was disappointed to discover, however, that PTLens only works on Windows, not OS X. I usually use PTLens to correct lens distortions that tend to be a bit of a problem with my 18-135mm. Without the plugin, this photo looks a bit funny, particularly up in the top right corner. Oh well, I like it anyway. Does anybody know of a good lens distortion plug-in that works on Macs?