It is rare that I mention, let alone recommend, something that costs money, but this one is well worth it.
WIDE World offers online certificate courses for educators on topics ranging from Teaching for Understanding to Differentiation to Teaching with New Technologies.
They have courses of study, or you can take individual courses that you are interested in.
I have taken Teaching to Standards with New Technologies 1 and 2. I found the courses to be well designed and planned out. Each course had readings from books and web sites, online activities, research and assignments, and online discussions as part of the program. WIDE World emphasizes Understanding By Design and we used the UbD lesson format in our assignments.
There is a discounted fee for people who sign up as part of a group.
I recommend this program to my colleagues.
I would like to hear feedback from any readers who have taken courses through Harvard's WIDE World program.