The most obvious solution to users who clumsily press random keys on the keyboard due to thick fingers is a capacitive stylus. The problem is, there are hundreds and hundreds of said accessories geared towards such users and choosing the right one can be difficult. You have to factor in the product's responsiveness, size, feel and more.
Apple recently rejected an iPhone application designed as a promotion application for the Droid smartphone. The submitted iDroid applocation displayed the red glowing eye used in Droid marketing along with marketing bullet points. You've got to give them credit for trying.
The rejection makes sense in that direct marketing with an application is prohibited by Apple's terms of service for iPhone app developers, which makes it likely that the developers knew iDroid would be rejected and were hoping to spin that into publicity for themselves.