Google Desktop searches:

•   Gmail
•   Outlook contacts
•   Outlook appointments
•   Outlook tasks
•   Outlook notes
•   Outlook journal
•   Outlook Email

•   Outlook Express
•   Word
•   Excel
•   PowerPoint
•   Internet Explorer
•   AOL Instant Messenger
•   MSN Messenger
•   Google Talk

•   Netscape Mail/Thunderbird
•   Netscape / Firefox / Mozilla
•   PDF
•   Music
•   Video
•   Images
•   Zip Files^New!

... and even more items if you add these plug-ins.

Developers: If you don't see your application listed above, you can help by writing your own plug-in.