Vishay Telefunken's MicroMELF Glass Diodes have the same footprints as the SOD110 and SOD323 packages. Moreover they provide a higher power dissipation of 500 mW compared to 400 mW of the usual SOD devices.

Why Square?
Easy handling
Fast pick-and-place
Standard mounting tools
No roll away

Why Glass?
Hermetically sealed
Significantly more cost-effective than plastic
High quality (AOQ < 5ppm)