I noticed an interesting shortcoming to the Platform today -- you can't define what types of attachments are accepted (the default being certain types of audio and video types defined in the code). Seeing this, I turned off the media checking. Alas, no joy: The post and genpage code only sees the media files. No good for some of the applications I'm intending, where attachment text, code samples, DOC files, PDFs and so forth are needed.
Update: as you can see here now, we've got this fixed.