You most likely know this already --- I'm mainly posting it because I tried a couple of flickr download tools before and never had any luck.
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FlickrDown <<
You can use this to backup all the files from your flickr account with just a few clicks.
Technical sidenote: Works like a charm on Vista, although if your regular work account is a "normal user" (as it always should be) you need to move the startmenu links from "admininstrator" to "all users". Proxy support is built in.