I just have uploaded
ZimbraCheck to Gallery and created a wiki page fot it. The Links:
Gallery:
http://gallery.zimbra.com/ZimbraCheck
Wiki:
http://wiki.zimbra.com/ZimbraCheck
ZimbraCheck is a small application that sit in your system tray and popup a message every time you get new email.
PD: im "re-posting" this because the entries in gallery and wiki more information.