Pocket Informant
Built in Calendar does not show graphically in the month view when during the day your meetings are and does not have any ToDo functionality. Pocket Informant synchronizes with Google and other ToDo sites for ease of use as well.
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The Weather Channel – local forecasts, radar maps, storm tracking, and rain alerts – weather.com
Much better information on more locations including Sever Weather and other notifications. Has very nice graphical map with radar and other information that is not available from built in app
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Evernote – capture notes and sync across all devices. Stay organized.
Synchronization with Wife’s lists and adds Picture and Voice memos. Honestly I go between Evernote and YouNote and just picked Evernote as has a little better synchronization capabilities.
Snapture
Can take back to back pictures without waiting for processing and writing of the pictures. Can take pictures by touching anywhere on the screen and just generally better at taking pictures than the built in app
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Bloomberg
Far better and more detailed information, with news that is not available from Stock built in app