The following sites will show some examples on how Frames are being used on the net. I've refrained from labelling the examples good, bad or ugly. Leaving that up to you the viewer to decide.
Frames can be quite useful, and a great design tool if used properly.
But, like a lot of things on the net it can be used and abused. I guess that's one of the things that makes the net such a 'unique' place. When you click on the link below you should be taken to the first example site. There will be a small frame on the bottom of your screen that will guide you through the examples and take you back to this resource, of course unless you get surfed away.