In the few decades of its existence, "Interaction Design" developed some rules and guidelines to achieve successfully results. Terms like Usability and Ergonomics are strongly associated, but beneath all logical reasoning emotionality may not be missed out to avoid users´s frustration. Literature about this phenomenon is available.
However, a fractional amount of this explicit dealing with touch screen based devices. Since mainstream exposure occured with Apple´s multi-touch technology, a rising number of developers are confronted with this subject. What are the rules for design effective touch interfaces?
This is presently being investigated. Following link relates to Kevin Arthur´s blog whichs central theme is the research on touch interface usability:
Given below a link directs to a theme-fitting article by Suzanne Ginsburg named "Iphone App Usability Heuristics":
Punchcut, an interface design company located in San Francisco, released "5 Considerations when designing touch interfaces".