We currently use the Remote AP functionality for offices in agencies that have their own firewalls, but who still want to participate in the Enterprise-WLAN system. In addition, to save expenses, we don't place a small WLAN Controller at the sites - just the AP itself. The AP then is part of our enterprise-wide WLAN, the agency gets wireless services, and folks are happy.

Don't forget about being able to take a Remote AP to a conference for demo's (etc.) and be able to have your fully-protected corporate network wherever you're at. Nice!