Semantic pointing [BGBL04] is a novel interaction technique that improves target acquisition in graphical user interfaces. Semantic pointing uses two independent sizes for each potential target presented to the user: one size in motor space adapted to its importance for the manipulation, and one size in visual space adapted to the amount of information it conveys. This decoupling between visual and motor size is achieved by changing the control-to-display ratio according to cursor distance to nearby targets.
A [demo] of semantic pointing is available as a java applet.
Semantic pointing effectiveness was tested by a controlled experiment (see [BGBL04] for details). The data collected by the experiment are available here for research purposes. Feel free to use this data set but please, drop me a mail if you conduct some interesting analysis on it and before including it in your work.