Over at the Exchange Team blog they just announced some additional info on sp2
and database size limits. One really cool feature now available in both standard and
enterprise is the ablility to set a maximum size limit for a database. This was something
not available in the past and is a nice addition. They also give you a 24hr warning window
before taking the database offline so you can take the appropriate action. Hopefully
these changes will be implemented in the UI instead of as registry settings.