Last week, we released b2tr for SharePoint.  The first thing I urge you to do is read the instructions to install the patch and also the readme.  The time spent understanding what the product group has spent time documenting will save you alot of time vs trying to go at it on your own.

Here's the link to all the downloads: http://blogs.msdn.com/sharepoint/archive/2006/09/14/754612.aspx