What makes a good frame?

Is there anyway of looking at a frame and knowing what kind of steel tubing its made from? mine has lost all its stickers and i was just wondering how good or bad it maybe?
you can tap along the top tube and if it goes from a tinny sound in the middle, to a duller sound towards the ends, its double butted ;) . if it's an english frame 9/10 it's reynolds tubing