The benefits will also probably be too small to measure with most browsers supporting gzip and IIS supporting gzip out-the-box.

[)amien

In addition providing minimal benefit, it will, in certain cases cause problems in the output pages. I tried it a couple months back and ended up ditching it after a few minutes. If I recall correctly, it created some problems with inline javascript, which doesn't like having certain whitespace removed. As the previous poster alluded to, the real bang for your buck is in gzip compression, which can easily be added to your entire site, or selective pages:

http://www.codeproject.com/aspnet/HttpCompressionQnD.asp
http://www.blowery.org/code/HttpCompressionModule.html
http://www.microsoft.com/belux/msdn/nl/community/columns/desmet/compression.mspx