Check out http://support.microsoft.com/?id=937191 for the list of fixes included in BDD 2007 Patch 1, as well as for the links to the MSI patch files (MSP's) that can be downloaded. When installing the patch, be sure to use a command line such as:
msiexec /update BDD2007_x86_Patch1.msp REINSTALL=ALL REINSTALLMODE=as /quiet
If you're curious as to what files have been changed in this patch, here's a list.
- Microsoft.BDD.WDSEnum.exe (link options only)