I really liked the Bledsoe article because it was an excellent yet realistic example of collaborative writing process. Note, though, that he said I will teach the curriculum my way, which is collaborative for students but not for teachers. I see the focus in the school district now as being one of teacher-share: small mixed-class reading groups, collaborative SMARTBOARD lessons, required team meetings, for example. I see the curriculum being jammed into short, fragmented days which don't allow the freedom to create over the length of time Bledsoe takes with his projects. We can 'do it,' 'make it happen', but the more compressed and compartmentalized and skill-driven teaching becomes, the less viable an authentic collaborative writing workshop may be.
Over the years, I have participated in both cross-grade and intra-class collaborations. For several years, I paired my fifth graders with a primary class for a poetry unit. The big kids were amazed by the imagination of the little kids and the little kids were impressed by the attention and writing skills of the fifth graders. One of the favorite types was color poems. The fifth and first or second graders would alternate images a la HAILSTONES AND HALIBUT BONES. One year my fourth graders wrote and acted in 'animal plays' that they wrote in small groups. It was an act of faith on my part to give the students so much freedom, but they rose to the occasion and made everyone proud. I haven't done anything electronically, but I see a variety of potential explorations.
On a personal level, I do a lot of newsletter articles for a variety of groups of which I am a member. Sometimes people like what I've written, but other times I really have worked collaboratively with another person not just as editor but as co-author. Two heads are usually better than one.