It depends on how deep you want to go. For basic file comparisons, you can
use WinDiff, which ships with Visual Studio 6 (not with VS.NET
unfortunately). It is not as full featured as some file comparison tools, but
it is already installed if you have Visual Studio 6 installed.
If you are comparing source, the diff feature in SourceSafe works rather
well.
I have not tried the open source project mentioned on another answer to your
question, but it should be a good option, as well.
--
Gregory A. Beamer
MVP; MCP: +I, SE, SD, DBA
***************************
Think Outside the Box!
***************************
