Integration of all apps
The integration between applications is ever evolving. These are just a few of the ways you can work between apps:
You can create a To-Do item in Mail and email it to another Mac user who can immediately add it to her iCal or Mail list. To-Dos you create in a .Mac Mail account are automatically added to iCal. Contacts from your Address Book can be dropped into an iCal attendee list.
You can drag text or graphics from one document in a particular application and drop them into another document in a different application (or a different doc in the same app, of course).
The "page proxy" is that tiny document icon that you see in the title bar of an open document, just to the left of the document name. Save the document (because it won't work if you haven't saved it), then drag that page proxy from a title bar and drop it into an email to send the file, an iChat text field to share it with someone else, a Bonjour user's name to send it to another computer on the network, into another folder to save a copy, an iDisk folder to send it to your iDisk, or even drop it into another document. The page proxy is not an alias! If you throw the proxy away, it will throw away the document. To create an alias, though, hold down the Option key and drag the page proxy anywhere you want.
The photos you take of your friends with your iPhone appear in the email messages they send you. In iChat, buddies can see the name of the song you're listening to via iTunes. In Mail, the green bubble appears next to the emails from a Buddy who is currently online. The birthdays you've noted in Address Book can appear in iChat. RSS feeds from Safari can show up in Mail. In Mail, you can hit a keyboard shortcut to add an email address to Address Book. And on and on!