It would be a useful option to provide the ability to compress data on the fly for client connections, in a similar fashion to the encrypt option when you connect to a database. For example, from the client application you could connect with:
Data Source=sqlserver;Initial Catalog=master;Integrated Security=SSPI;Compress=yes
It would be a great ability for remote offices connecting into a central database server over a slow WAN connection and would result in cost savings for small businesses. Larger businesses would probably use dedicated hardware like PacketShaper (http://www.bluecoat.com/products/packetshaper/specifications).