The DX comes with two keyboards. The default keyboard does not capitalize the I while the Alternate Swype keyboard does. The Swype keyboard has a lot of features, and to understand them all you should actually go to their website and watch the videos they have made.
The Swype keyboard really works nice with just a little practice, you can miss letters and the word is still spelled right.You don't have to space between words. After a period it will capitalize the first word. Words that have two capital letters such as McDonald can easily be done with Swype. A lot of punctuation is done for you.
When proof reading your message you can put the cursor on a word you are not sure about and push the blue Swype key and get a list of different choices. If the choice you want isn't there, the whole world will be automatically selected allowing you to enter a new word if you want.
It also has a full editing keyboard you get to by pressing the blue Swype key and the key to the right of it at the same time. It has arrow up, down, left, right, end of line and much more.
The Swype keyboard can by used the old fashioned by pressing 1 key at a time if you prefer ( or if it is a work that Swype most likely would not know - but it can be added to the dictionary).
It has many settings that can be changed to your liking, such as how often the word suggest should appear.
Overall I type a lot faster and a whole lot more accurate with Swype.