Jim Moffat has taken the initiative and is forming a Groove User Group that looks very interesting. I've joined up and will add what I can. Other prominent Groovers are also coalescing around www.grooveuser.org.
Not to say Microsoft hasn't been pushing Groove hard enough. I'm sure you won't hear anyone say such a thing. I know I'm not going to say Microsoft hasn't been pushing Groove hard enough...
The thing is, it's still a great virtual team solution, but now it has to prove its right to exist within the gargantuan MS Office world. Honestly, Groove could use another zero or two at the end of its install base numbers to become a full-fledged member of MS Office.
But, by providing a still compelling solution for virtual teams, by inspiring enough from its user base to form user groups and maybe even by still having a special place in Ray Ozzie's heart, Groove will get those numbers.