I want everything :)

Seriously, I want an outlining tool that will offer me a very
information and feature rich environment on my desk/laptop, yet
allow me to add/edit outlines on my PalmPilot (I realize these are separate platforms and would require separate apps, but I want it all
to interoperate) and use a file format that would at least be easily
parse-able (Preferably OPML/XML or at least something not binary) so
I could utilize and possible even edit outlines under UNIX when
I'm there.

Like I said, I want everything :) I'm hoping that at some point
I can find some mix of commercial tools and my own to achieve
this, it doesn't seem like rocket science, just a matter of
getting everything to coordinate.