Microsoft recently announced some nice changes to SharePoint 2010 Data storage limits. If you have installed SharePoint 2010 SP1, then you can now take advantage of a larger content database limit. Previously, the content database limit was under 200 GB for collaboration and < 1TB for document archive. However with SP1, SharePoint 2010 now supports up to 4TB of data in all usage scenarios and there are no imposed size limit for document archive scenarios.
The second important change is that the SQL Server FILESTREAM RBS provider is now supported for use with SharePoint. Good news for admins and companies as now lower cost iSCSI connected NAS disk can be used.
There are some additional changes that has been explained in the blog post here. Make sure you read it to understand the changes better.