And just where is William Hung today?

"He's Hunging-out in the Los Angeles Sheriff's Department as a technical crime analyst."

Hanging around with his buddy Wun Hung-Lo

In addition to what Alf has stated, he's still raking in money from his only album, and banging some groupie chicks.
The guys who went to school with him at Berkeley,  who talked him into auditioning, expecting to make a national joke of him, are kicking themselves in their collective a$$es. 

That's a good last name.

Wikipedia says that he's working as a crime analyst in Los Angeles and retired from music in 2011.