I've been working on writing a php app that will allow me to post to my blog by email. Tonight, I got all of the pieces nailed down. It's just a matter of putting them together.
One thing I learned. When placing an xml-rpc request, the MT docs talk about an appkey. I couldn't figure out what they were referring to until I looked at the blogger api. You need to fill out this form and you'll get a developers key to use with your app. If you were placing calls against blogger, different apps could be tracked. As of now, I don't think MT has a tracking system for xml-rpc requests.
As I get more of this worked out, I'll be posting links to the information I used, and maybe even opening a working system for others to use. We'll see.
According to the MT docs, MT ignores the value of appkey in all the Blogger API methods.
AH. You're right, way down at the end of the list of supported methods, there's one line saying they ignore it. That's what I get for not reading carefully. I looked under the functions that used appkey for an explanation of what it was supposed to hold, and when I didn't see it there, I went looking at the blogger api, not further down the document. My fault. Thanks for pointing it out, but now that I have the key, no harm it using it, right? Worst case, my system will be blogger ready if I ever rollit out publicly.
Have you gotten anywhere with this? I was looking for a PHP way to do this and your site is the only thing I've found. Thanks for any help you can provide.