So, my current phone/PDA is a BlackBerry 7100t, and has been for a while. Great little device. Doesn't have the keyboard the Sidekick did, though...instead, it has a pseudo-Qwerty keyboard, where each key has two letters (for the most part). You type, and it guesses from its internal dictionary which word you're aiming towards. If it's guessing wrong, you can kind of coach it along in the right direction. You can also coach it towards words it doesn't even know...It will then add these to a 'Custom Words' dictionary, so the next time you type it, you have to do less coaching.
Earlier this week, I updated the OS. Now the phone has a new option under the 'Settings' screen, called 'Custom Wordlist'. It lets you view, edit, add, and delete custom dictionary words. Peering through the list I've acquired over the months was quite enlightening. I thought I'd share a selection of words I've had cause to type into my cell phone: