>I am trying to prefer XMLHTTP for everything, but I have not yet figured out a way to send binary with it. I can suck the binary stuff in, but I can't post it properly for some reason.

I've never done it either, but something tells me, that since XML itself doesn't handle Binary data that well, that teh XML HTTP object doesn't necessarily support it. You might wanna check out the MsXml4 Tech Preview, to see if that can do it now, though.