I was fortunate enough to be invited to dinner with Meng Weng Wong, Harry and Jim from Microsoft, and some others from Verisign, IBM, Spamhaus, etc. Over beers, we talked about the ideas that Meng/Harry/Jim had hammered out over the previous couple days. (This is part of the MARID working group meeting last week, though not the only part. Is anyone interested in the rest of the meeting? :)
I am a long-time supporter of SPF and I was skeptical of anything that would appear to be a compromise to MS. But, the two proposals had more things in common than they had differences.