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Diamond Frame
This is the standard design for a bicycle frame, and has been for over a hundred years, since it supplanted the cross frame. It is one of the most nearly perfect pieces of design known, due to the extreme amount of refinement it has undergone over the last century, and its purity of form. It is unlikely that the diamond frame will ever be surpassed as a way to build a rigid-frame bicycle using joined tubes as a construction medium.
This is not to say that the diamond frame is the end-all and be-all of bicycle design. Monocoque construction with suitable materials has real merit, and the design of bicycles with rear suspension is at a stage where many different designs appear viable.
