Oomph: A Microformats Toolkit is for web developers, designers and users, making it easier to create, consume, and style Microformats. Oomph is an amalgamation of applications: an Internet Explorer Add-in built in C++ that finds Microformats on a page; a cross-browser HTML overlay built using JQuery that aggregates Microformats; a set of beautiful CSS styles for Microformats; and a Windows Live Writer plug-in written in WinForms for inserting hCards.
If all you are interested in is the Internet Explorer Add-in and Windows Live Writer Plug-in, simply download the binaries, which has an installer. Otherwise, download the source code. Note that the documentation is included in the source code.