I'm thinking of making it easier for me to blog to my http://www.advogato.org/diary/ . I should look at the blogging Emacs modules to see how (or if) they handle offline operation. I think I can do it like e-mail - queue unsent items in a file, then delete as sent. If all else fails, I can write it as a normal e-mail module, then have a Perl script on the other end upload the e-mailed stuff to http://www.advogato.org .
I guess this belongs more to remember.el than planner.el, as I want to mirror upon remember. =)