I have been so frustrated and at the same time very rewarded.  This course has challenged and confused me at every turn.  I think the best example I have, however, of a time when everything seemed to come together to demonstrate "global collaboration" was on Challenge 13.  Several of the course members combined their efforts and created a wonderful collaborative project.  We communicated with one another and edited content in the true manner and spirit of a global collaborative project.  For me, that one Challenge, really demonstrated and concreted in the whole idea of how the tools we have been experimenting with and using can broaden our classroom's horizons and expose our students to the diversity of ideas others in the world offer!