Graphic User Interfaces
R is a command line driven program. The user enters commands at the prompt ( > by default ) and each command is executed one at a time.
There have been a number of attempts to create a more graphical interface, ranging from code editors that interact with R, to full-blown GUIs that present the user with menus and dialog boxes.
TINN-R is my favorite example of a code editor that interfaces with R for the windows platform. I had some trouble with the installation until I followed the directions provided by BioInformatics in Arkansas. Now is works without a hitch.
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Perhaps the most stable, full-blown GUI is R Commander, which can run under Windows, Linux, and MacOS X (see the documentation for technical requirements).
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Both of these programs can make R a lot easier to use. For information on other GUI attempts, see the R GUI Projects page.