Rounded Corners?

I gots a question :D

I've searched the memories, and haven't come up with anything.

I'm looking for a tutorial describing how to round the corners of a square/rectangle. I saw a one somewhere, but I didn't add it to my memories and now I can't remember...

So if someone could help me out, I'd love you for it!

[ Side Note: I really appreciate this community - everyone is so kind and helpful, and the tutorials are great! Thanks for taking the time to write them up. ]