Ugh, why can't this person have a simple comment form? Even enabling all the scripts on the page, I can't seem to post a comment on the blog. So here's the one I wrote...<p><i>Have you tried Org Mode? (<a href="http://orgmode.org" rel="nofollow">http://orgmode.org</a>)<p>I find it totally indispensable for keeping track of all of my Todo items -- and a lot more besides. It has exporters for various formats, including HTML, PDF/LaTeX, and plain text. Rather than storing your data in the inaccessible cloud, it encourages you to store your Todo files locally, but makes it easy to sync them (e.g., with a service like Dropbox). External projects like MobileOrg for iPhone (<a href="http://mobileorg.ncogni.to/" rel="nofollow">http://mobileorg.ncogni.to/</a>) and Android (<a href="http://matburt.net/?p=94" rel="nofollow">http://matburt.net/?p=94</a>) provide a way to read Org files on your mobile device.<p>I realize that sounds like a bit of a commercial, but the point as it relates to your post is this: the Org format, which is a plain text format, is already a rich representation for task management. It is used by several different apps, and already has exporters for other formats. You could always extend Org to export to OPML like you have envisioned, too, without too much work. There is a lot of work being done on exporters these days, and I think you would find good support in the community if this was a project you wanted to work on.</i>