I believe reputation is a key dimension ignored by both the SLATES and FLATNESSES models for Enterprise 2.0. Peter Reiser from Sun recently made an announcement on open sourcing the community equity engine they built for SunSpace.You can see the presentation here
This is a comprehensive model to roll up a community equity score for each person in the community. Recognition by peers goes a long way in driving adoption. A Jive SBS interface into this would be a great feature to have.