New speech-related utilities here. A new addition is BuildAppLex:

BuildAppLex Speech Utility for Microsoft Speech Technologies
BuildAppLex.exe is a command-line tool that allows you to create an Application Lexicon, using the Speech API. It takes one required command-line argument: a text file containing a list of words and their corresponding pronunciations.

Also, a while back, Robert Brown mentioned that a new managed interface for the Speech APIs is now available here. In a few lines of C# code, you can do either speech recognition or speech synthesis. (To play with the API, you also need to install a regognition engine - for example the one from the latest SAPI SDK)