>http://www.microsoft.com/sqlserver/2008/en/us/R2-editions.aspx
>
>SQL Server 2008 R2 Standard
>
>SQL Server 2008 R2 Standard delivers a complete data management and business intelligence platform for departments and small organizations to run their applications—helping enable effective database management with minimal IT resources.
>
>The following capabilities are new to Standard:
>
>Backup Compression to reduce data backups by up to 60% and help reduce time spent on backups *
>Can be managed instance for Application and Multi-Server Management capabilities
>High-scale complex event processing with SQL Server StreamInsight™
>* Source: Technet

Thanks