Zotero technically has a blogspot translator, but it doesn't work for all blogspot blogs. There is a good amount of variation between blogs, especially the way they present their metadata (most of the blogs don't). This could be improved somewhat, but it's a good amount of work to do it well.
Volokh has some embedded metadata (particularly interesting and up-to-now unsupported is the "parsely-page" meta tag) and we could scrape it. We actually do scrape some metadata using our generic Embedded Metadata translator, but we don't recognize it as a blog.
Edit: I tweaked our Embedded Metadata translator to recognize blogs as such and to scrape parsely metadata. Volokh pages should import better now.
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Volokh has some embedded metadata (particularly interesting and up-to-now unsupported is the "parsely-page" meta tag) and we could scrape it. We actually do scrape some metadata using our generic Embedded Metadata translator, but we don't recognize it as a blog.
Edit: I tweaked our Embedded Metadata translator to recognize blogs as such and to scrape parsely metadata. Volokh pages should import better now.