I'll second James' recommendation for Boise State. I work with someone that graduated from BSU and the quality of the program shines through regularly. I also know one of the instructors in the program and you can't go wrong.
I know plenty of folks from the Florida State and San Diego State pipeline as well. I've participated in the San Diego program. These, along with Indiana are well respected programs. Each of which, I believe, offers a certificate program. All of which are listed on Tess' list above.
I think the best approach is to figure out what types of tasks and outcomes you're most interested in attaining and shop for a program that matches this most closely. Curricula vary greatly from school to school.
@Tess -
That's a great list