Thickbuttons
If you really want a Qwerty Keyboard, you can install ThickButtons : http://www.thickbuttons.com/
I've tried it on mine, and it works, although the buttons are still a bit teeny to type on - I found I could type much faster going back to the 9 key predictive text system you get by default.
I've had my x10 mini for about 3 weeks now, and am, on the whole, very happy with it. The only quirks I've found is that it has a habit of losing wifi signal until you turn the wifi off and on again (though this may be related to my ancient belkin router, as I haven't noticed the problem when connected to other hotspots) and its weird habit of being a bit sleepy in the mornings when it wakes to sound an alarm, leaving you stabbing frantically at the snooze button trying to make it shut up until it registers the press