Turn it upside down and back to front and you have an OR gate.
**broken link removed**
The trouble with diode logic is, you can't use it for more than one gate because there's no amplification so the voltage drops by half plus a diode drop every stage. You could get away with two, if use lower value resistors for the first gate than the second but two is the real limit.
There's also no inverting function which requires a transistor.
I like diode logic though and have never needed to use an AND/OR logic IC before, NAND, NOR yes but I've never needed non-inverting ICs and don't think they're very useful so I don't stock them.
I love glue logic though, especially CMOS gates because they're so versatile, even a hex inverter IC has numerous applications, from a metal detector to a PWM controller.