Ray Ozzie's Weblog "Interesting factoids from Groove usage analysis aggregated across a very broad statistically significant anonymous sample set. I did this in order to empirically validate some intuitions related to some UI design enhancements that I'm considering.
The analysis does indeed validate that the 2-25 design center of the product is precisely the sweet spot of where it's being used in practice: approximately 35% of shared spaces are between a single pair of individuals, 60% of shared spaces are between 3 and 25 individuals, and 5% of shared spaces have more than 25 individuals. Amazingly to me - given the design center of the UI - I found that within this 5% there are actually hundreds of spaces with 100-250 members each; I'd surely never have expected this.
One other incredibly fascinating tidbit: 25% apparently use shared spaces with only themselves as a member, using Groove as a "briefcase" to transparently and securely synchronize files across multiple computers that they own - e.g. Office documents being synchronized between home and office PCs."