- Sharing Pictures
Instagram (Instagram) Take a picture or choose one from your album. Add a filter if you want . Pick the social site you want to send it too, click Done and that’s it - Social Media
Twitter Application There are dozen of Twitter applications for the Iphone. If you have a favorite Twitter desktop application there is probably a matching Iphone application. However if you are looking for something simple you can’t beat the official Twitter application.
Facebook Application Unlike Twitter there are not a lot of Facebook applications, there are some, but despite its shortfall the official Facebook application is still the best. - Business or Twitter Power User
Hootsuite
If you have multiple accounts or are trying to keep track of statistics then I would go with Hootsuite - Notification
Boxcar If you like to be notified when ever a message comes in to you from Twitter, Facebook, Email, Growl and RSS then Boxcar is the application for you - Storage
Dropbox Need to share files between your computer and the Iphone. View those files on the Iphone. Then Dropbox is the application for you. This does require you too have Dropbox account. You can get one for free that gives you 2GB of storage. - Notetaking
Plain Text Plain Text is a simple note taking application that sync directly with Dropbox. Unlike the default note taking application Plain Text allows you create folders. - Rss Reader
Reeder One of the first things you will notice about Reeder is that it looks good. The second thing you will notice is it is easy and intuitive to use. Allows you to favor and share with your favorite social sites. Send to Instapaper, Pinboard and Readitlater. It does sync with Google Reader, so if you don’t use Google Reader this may not be the application for you. - Music
Pandora Pandora is a great way to listen to music that you like but may not own. - Games
Angry Birds Ok Angry Birds is really a must have, but it sure is fun. - Voice Recorder
Italk
Looking for a way to do high quality recordings then Italk is the place to start. Easy to use . Gives you high quality recordings which you can email or with the use of Italk sync you can sync it directly to your computer.
Whether you like an application or not is often a matter of personal preference. For me these are the ten applications that I can’t do without. Most of them are also available on the Ipad and Itouch. As I said before the best way to find a good application is to ask people you trust what they like.