I really like the web app just launched by Visto for corporate email. They way they've designed the directory to supplement mail is pretty intuitive thinking.
YouTube example: http://www.youtube.com/watch?v=nEO93-1aeVE
Press release: http://www.sys-con.com/read/456264.htm
YouTube example: http://www.youtube.com/watch?v=nEO93-1aeVE
Press release: http://www.sys-con.com/read/456264.htm