If you have an Android or touchscreen Symbian device (e.g., Nokia N8, 5800, X7, etc.), download SWYPE (http://beta.swype.com for Android, http://store.ovi.com/content/58438 for Nokia). Swype is an intuitive touchscreen keyboard that is particularly useful in portrait mode on smaller phones, though its usefulness extends to any device it is compatible with. Some Android phones come with Swype built in, so check your phone first!
Unfortunately it is not available for iOS (yet!!!...hopefully Apple allows it one day!). I have an iPhone 4, but I recommend Swype to all my Nokia and Android using friends. 🙂
*edited to add a subject line - this was part of the tech tips contest (Gina)
Some of my favourite apps:
My must have (or must try) apps: