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The new version of Mail.app for leopard will allow for data capture. A picture is worth a thousand words, so watch this video real quick. You will notice that when Mail sees something that looks like a contact's name address, phone number or date it will offer to add it to the address book or iCal

What this means to you, if you are using Daylite with sync services, is that once that person is added to the address book, it will be available in Daylite and the same goes for an appointment in iCal. Seemlessness, it's a wonderful world indeed.