Better late to the party than never! I'm finally getting a chance to use WSE 3.0. The download can be found here:
I'm going to use the MTOM feature (formerly DIME) to send binaries via web service to a web application. Using MTOM will speed byte transmisison between layers.
Here is an article on how to enable both ASP.NET Web Applications and ASP.NET Web services to send and receive large files.