Note: These are all super old apps by now, so they probably aren't good examples any more.
Erica Sadun's iphone 3.0 cookbook: http://github.com/erica/iphone-3.0-cookbook-
AppStore reviews scraper: http://github.com/gambcl/AppReviews
App Sales mobile for daily sales: http://github.com/omz/AppSales-Mobile
This one will teach you how to use the accelerometer pretty well: http://github.com/haqu/tweejump
The Yammer iphone app: http://github.com/yammer/iphone
Reddit's iphone app: http://github.com/reddit/iReddit
Port of the old gorilla's game: http://github.com/Lamentum/Gorillas
Matt Gallagher's audio streamer: http://github.com/mattgallagher/AudioStreamer
More:
31 apps in 31 days: http://www.appsamuck.com/
wikiHow source: http://github.com/keishi/wikihow-iphone-app
tetris alternative: http://code.google.com/p/tris/
twitter client: http://github.com/takuma104/ntlniph
molecules: http://sunsetlakesoftware.com/2008/10/02/molecules-source-code-now-available
time tracking: https://github.com/lessallan/freshbooks-iphone-project
a ton more from matt gallagher: http://projectswithlove.com/projects/index.html
a list of even more: http://maniacdev.com/2010/06/35-open-source-iphone-app-store-apps-updated-with-10-new-apps/
and more... http://visionwidget.com/resources/icons-png/509-open-source-iphone-apps-in-app-store.html
a new one called Briefs.app which should interest everyone here: http://iphonedevelopment.blogspot.com/2010/08/briefsapp.html and http://github.com/capttaco/Briefs
and more.. just kidding. that's all i got
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