If you’ve got a blog running WordPress (the self-hosted .org variety), Anthologize is a plugin which will allow you to publish your posts as a PDF, ePub, or TEI (a scholarly file format). There’s also an RTF option, but the creators point out that it’s still buggy. There is not currently an option to export files as DocX or ODT, but the program’s creators say it’s a feature to look for in future builds, along with the ability to export comments left on the original posts.
Anthologize is targeted at academics–for instance, professors who kept a class blog, or someone who wants to distribute their notes about a conference, or someone who wants to publish field notes as part of a research notebook. The academic focus is a result of the plugin’s origin at the One Week, One Tool program, in which 12 humanities scholars come together and conceive of and build a useful open source digital tool within a week. The program, funded by the National Endowment for the Humanities, sees itself as sort of a digital barn raising: a group of people coming together to make something useful for the wider community.