Frequently used programs not automatically added to the Start menu KB282066
The list of English "poison words" is given in Knowledge Base article 282066.
For those of you who were reading this Old New Thing article on the Start menu blacklist and wanted to learn what those "poison words" were, but found nothing at KB282066: here you go, thanks to the Internet Archive's Wayback Machine:
http://web.archive.org/web/20091004062249/http://support.microsoft.com/kb/282066
Frequently used programs not automatically added to the Start menu
KB282066
That snapshot was from 2009-10-04, the last before it went dark.
PS. You might also be interested in this algorithm that determines which programs to list on the Start menu, one which Raymond describes as "conceptually simple but complicated-in-practice" [source].