Sometime back I found myself in a slightly similar situation. I felt like I had forgotten many things I had learned in my masters (CS), and I also felt that many new technologies have come about and I do not know enough about them.

I organized my learning goals as another masters in CS, and have started doing the first course (web technologies). For each course I plan to identify open courseware and other resources and blog as I learn stuff. I am hoping my blog will help me establish a learning trail, which might be an alternate for the credentials of a paper certificate.

Check it out - http://opencs.wikidot.com