I have somewhat big fingers and typing on portrait works well for the most part but htc's auto correct works really well and takes care about 98% of my errors. But landscape typing is perfect. Sure its smaller than its cousin the EVO, but like any and all touchscreens your fingers will adapt to it and all will be fine.
Swiftkey is pretty good keyboard app. More accurate than the stock keyboard IMO.Does anyone know how Swiftkeys is on the Aria?