Hi Andy,Easy VPN Server feature on your router is for providing remote users the ability to VPN to your network using IPsec. The Easy VPN client allows for Lan-to-LAN VPN whereby you could statblish an IPsec encripted tunnel to either a router, pix, asa, or vpn concentrator at a remote site-network.
Some more details on Easy VPN Server
http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_feature_guide09186a008055c37a.html#wp1276737
Easy VPN client - for Lan-to-LAN vpns etc.. read here for more details
http://www.cisco.com/en/US/docs/routers/access/800/850/software/configuration/guide/vpnezvpn.html
To learn more about your router and its features refer to this page.
http://www.cisco.com/en/US/products/hw/routers/ps380/products_data_sheet0900aecd8028a976.html
pls rate any helpful post if it helps
HTH
Jorge
Jorge Rodriguez