While I have found iOS to be a very intuitive operating system, both powerful and streamlined, not all of the useful functions are readily obvious to everyone. Here are some handy tips courtesy of OSX Daily:
Make typing on your iPad or iPhone more powerful with these eight techniques. The article includes some obvious information like double tapping the space bar to automatically insert a period, to some that I wasn’t aware of such as the ability to make personalized shortcuts for frequently used phrases (creating a short string of characters that when typed your device will display as the linked phrase, for example ttyl would be displayed as talk to you later).
Maclife brings you a list of current iOS 5 tips. Some are repeated from the article above, but there is some very useful information here like how to create custom vibration alerts on your device or how to update your device without physically connecting it to iTunes. The list is updated regularly and has a huge number of tips.