Some features:

Web/Intranet based - Available from any workstation through a Browser
Simple to follow, Web based options and intuitive presentation
Flexible Repeating Bookings
Authentication with your existing user database (eg Netware, NT Domain, NIS etc.)
Ensures that conflicting entries cannot be entered
Reporting option
Selectable DAY / WEEK / MONTH views
Multiple auth levels (read-only, user, admin)
Support for bookings by time or period - ideal for use in schools
Room administrators can be notified of bookings by email
Multiple languages supported (translated to Catalan, Czech, Chinese, Danish, Dutch, Finnish, French, German, Greek, Italian, Japanese, Korean, Norwegian, Portuguese, Slovenian, Spanish, Swedish, Turkish)
Stable and in use at many organizations
MySQL and Postgres support