YAI (You Are Invited) is a plug-in for Apple Mail in OSX 10.4 and OSX 10.5 that translates and transfers Outlook, Google Calendar, Zimbra and Exchange style meeting invitations to iCal. It corrects many incompatibilities between Microsoft Exchange style meeting invites and what iCal can understand.
Mia for Gmail (was Notifier Pro for Gmail) is a desktop Gmail client which sits politely in your menu bar.
