After the SP1 release of SharePoint 2010, product team changes offcially the boundaries limits of SharePoint.
You can consult all this new limits in the "SharePoint Server 2010 capacity management: Software boundaries and limits" page on MSDN here:
One of the most important thing is the new recommandation about the size limit of the content databases:
Content database size (general usage scenarios)
200 GB per content database
We strongly recommended limiting the size of content databases to 200 GB, except when the circumstances in the following rows in this table apply.
If you are using Remote BLOB Storage (RBS), the total volume of remote BLOB storage and metadata in the content database must not exceed this limit.
Content database size (all usage scenarios)
4 TB per content database
Content databases of up to 4 TB are supported when the following requirements are met:
You should also carefully consider the following factors:
For more information on SharePoint Server 2010 data size planning, see Storage and SQL Server capacity planning and configuration (SharePoint Server 2010).
Content databases of over 4 TB, except for use in document archive scenarios (described in the row below), are not recommended. Upgrading of site collections within these content databases is likely to be very difficult and time consuming.
It is strongly recommended that you scale out across multiple content databases, rather than exceed 4 TB of data in a single content database.