I've removed some really terrible things from back when I was mucking around with 3D, but only if they were either a) substantially the same as a subsequent (or preceding) submission or b) I thought it was terrible, and so did all the commenters.

Since I've started with photography, I've only been tempted to remove my very first submission, but then I looked at it, and realised that it wasn't really so bad, and just needed a new thumbnail!

Some of my early stuff I'm really quite proud of, and wish I could go back now with a better camera and take the same capture.

Actually, now that I go through, I DID remove one image - a pretty little idyllic scene, but poorly focused thanks to digital zoom. It never attracted even a single comment, so I wiped the poor thing.