At first glance, the WP7 appears to be limited in capabilities, but if you hold some of the keys, you will get a minikeyboard with more selections. Hold e and you get a choice of eëéêè or hold . and you get a choice of -!:?. Try some of the other keys like y,u,o,a,s,c,n and m.
Don’t forget the numeric keyboard, especially the $ key.
The space bar is also overloaded. If you need to end a sentence, double tap the space bar. A period-space will be entered to end the sentence and the next letter typed will be capitalized.
John Marshall… Visio MVP Visio.MVPs.org
john Visio MVP 
Very cool! The hiccup I found was sometimes a period gets entered AND a space, where you just want the period (and no space). I can’t remember the exact use case at the moment, but it does happen rather often.
The one I WISH MS had coded up was the holding of the SHIFT to get the shift lock.
Nice information!
Double tap the Shift Key to effect a lock.