iSMS - Send SMS to multiple people and delete selected messages from a conversation
ApolloIM - A Chat Client
TextEdit - Create and Edit TXT files on your iPhone
Finder - Explorer for iPhone
Catagories - Create Folders on the Home screen
Customize - Change the order of the icons in the Home screen and tweak the looks
LocateMe - A GPS feature for the iPhone, locate where you are on the Google Map!
All of them are available in the Installer app on the iPhone