I don't know what OS you're using, but in Win Vista (and I guess Win 7) those plugins and settings are in username/app data/roaming/calibre. When I reinstalled Windows a couple of weeks ago I just backed up my Library and that app data folder, then after reinstalling Windows and calibre I copied everything back where it belonged. It started up like it had never left. Not all software does that quite so easily, but it worked beautifully for me with calibre.
Edited to add: App data folder may be hidden by default so you may have to unhide hidden files and folders to see it.
Last edited by CWatkinsNash; 02-18-2011 at 10:50 PM.
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