And if memory serves, org-mode has a mobile hook ... here's a snippet from the Info page:
MobileOrg is an application for the
iPhone/iPod Touch series of devices,
developed by Richard Moreland.
MobileOrg offers offline viewing and
capture support for an Org-mode system
rooted on a "real" computer. It does
also allow you to record changes to
existing entries. For information
about MobileOrg, see
`http://mobileorg.ncogni.to/').
This appendix describes the support
Org has for creating agenda views in a
format that can be displayed by
MobileOrg, and for integrating notes
captured and changes made by MobileOrg
into the main system.
For changing tags and TODO states
in MobileOrg, you should have set up
the customization variables
org-todo-keywords' and
org-tags-alist' to cover all
important tags and todo keywords, even
if individual files use only part of
these. MobileOrg will also offer you
states and tags set up with in-buffer
settings, but it will understand the
logistics of todo state sets (*note
Per-file keywords::) and mutually
exclusive tags (*note Setting tags::)
only for those set in these variables.