I bought a cheep bench top psu for a project, its split into two modules, a control head with a micro with ttl broken out to an actual connector and an analog input supply board. Adding serial control would have been trivial, and definately useful. Adding usb serial would have been worth the extra cost. Yet here I am trying to decipher pwm signals so I can make it myself. 

Ugh, $35 dollar psu is going to be nice with new firmware. Now ill actually buy a few more.