As outlined in knowledge base article 926464, a new version of the Inventory Tool for Microsoft Updates (ITMU) is being released in the November timeframe. This release will focus on making the necessary changes to accomodate the new Windows Update catalog format. The changes being introduced are small and targeted at resolving the issue mentioned in the above KB article. Customers are encouraged to migrate as soon as possible once it is released. Greg Ramsey, an SMS MVP, has put together an excellent write-up which can be found here:

http://myitforum.com/cs2/blogs/gramsey/archive/2006/10/12/ITMU-Update-_2D00_-November-2006.aspx