When I was in grad school, I took a class on teaching math with technology. This was a bit odd because I'm a social studies teacher, but I loved that the class was explicitly about using technology (and I also like math). It was one of the best PD experiences I ever had because it was hands on. The professor showed us the tools we could use in class with our students, then we played around with them as if we were the students, then we discussed how to use them with our students.
And I think that's the fundamental principle - you need to model tech resources and encourage people to play with them. There's no substitute for experience when you're talking about tech.