I discussed this in my blog posts yesterday. I think that this would be a good move for both companies. I am not sure if it would be good for the consumers though.
I also believe that the breaking rumors of a Nextel spin off play into this in a big way: 1. as leverage to strengthen the company and fight off DT or 2. To strengthen the value of the company to make it irresistible to DT.
http://digtalnauseum.blogspot.com
The 2 posts are really long but this was a pretty good synopsis.