WhosOff.com is an online workplace leave management service that makes organising time off easy. It is simple to use and solves an enduring office problem that every SME has.."who's off ?" And what's more the service is Free! Recently reviewed on techcrunch.com techcrunch.com/2007/06/03/whosoff-easy-workplace-leave-management/
Update: Not free since November 2009 (as Ad supported model did not over the costs) - but still low cost solution for staff leave and out-of-office times - used by over 600 companies around the world . Now on iPhone, Android and BB