Jailbreak your device and get there apps from Cydia! You need them!

Auto3G – 5.99$

Turns off 3G on lock. Extends battery.

MyWi 4.0 – 19.99$

MyWi 4 – All New Tethering on iPhones + iPad for iOS 4.0! Includes support for 3.1+ and all iPhones (including 2G/3G/3GS) and iPad! Create a WiFi HotSpot with a press of a finger! Wherever you are – you can connect your laptop or other mobile device to your iPhone easily! You can also use MyWi 4.0 to enable USB Tethering on 3.1!

MultiCleaner – 0.99$
MultiCleaner is an advanced housekeeper for your MutliTasking apps. It can get to be quite a pain in the @$$ managing app, and MultiCleaner is here to help. The app will allow you to quit apps with a quick activator gesture and even allows you to customize the multitasking bar to your own liking.

FolderEnhancer – 1.99$

Improves and extends iOS4 folders.

GroupSMS – 1.99$
GroupSMS is an app that allows you to send SMS messages to a group of contacts. The apps comes with a built-in manage to quickly edit and create groups from your contact list.

DataCounter – 2.99$
Data Counter is a simple application that allows you to track your data usage over a period of time, and allows you to set up notifications when certain conditions are met. This is a a great app for those that want more instant notification from their data tracking.