ExamDiff

[Broni]

http://www.prestosoft.com/edp_examdiff.asp

ExamDiff is a freeware Windows 95/98/Me/NT/2000/XP/2003/Vista tool for visual file comparison. It has a number of simple and convenient features that many users have been asking for a long time from a file comparison tool.

Key Features

    * Automatically detects file changes.
    * One push re-compare function.
    * Drag and drop support.
    * Easy editing of the first and second files, by spawning an external editor of choice.
    * Saves the file differences in a standard UNIX DIFF file.
    * Easy navigation through the differences.
    * "Search" command.
    * Fully customizable.
    * Adjustable pane splitter with smooth synchronized scrolling.
    * Extensive command line interface.


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[michaewlewis]

winmerge has most of the same features, plus most that are included in the pro version of examdiff... and it's all open source. It can compare multiple files at once or directories...
http://winmerge.org/