Does anyone know how many:1. users can be in a SP group?2. SP groups per site or site collection?3. number of SP groups a user may be a member of?
This should answer all of these questions and more:Downloadable book: Planning and architecture for Windows SharePoint Services3.0 technet.microsoft.com/en-us/library/cc287812.aspx
This document is a good place to start,technet.microsoft.com/en-us/library/cc262787.aspx"Plan for software boundaries (Office SharePoint Server)"