From googling around in trying to get HTTP put enabled on IIS 7, I have concluded that turning on HTTP PUT verb support requires the installation of the WebDAV handler extension and that even then it only works in integrated authentication mode.  If this is not true, please let me know as I was forced to write my own put HTTP handler.  It actually turned out to be a lot easier than I thought it was going to be though.  Implementing IHttpHandler, I ended up just having to binaryread the request into a byte array and then use a binarywriter to write it to a file after validating the PhysicalPath of the request for user permissions and validating that the "pattern" is safe (ex. file extension, path).  I haven't tested the performance against the IIS 6 native solution, but it seems quite fast on today's server hardware.