I've tried various plugins to backup my tweets into WordPress but none did really the job (actually most were doing much more stuff I didn't need, and most didn't keep track of the "in reply to" bits I wanted to have), so I made my own, which has powered my tweet archive for some time now.
The plugin is now available for anyone interested: Ozh' Tweet Archiver (along with my archive's theme if you need an example). Cheers!
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