I use Anthony's 'patches' tool for tracking patch series on the mailing list (http://github.com/aliguori/patches). Patches knows which email threads have been obsoleted by newer patch revisions and which have been committed to qemu.git.
If you use notmuch to index your email, the following command marks emails read if they are obsoleted or committed: $ notmuch tag -unread $(patches list --format notmuch 'status:obsolete or status:committed') That way you don't have to wade through outdated email threads. It makes catching up on email much quicker. Note you need the notmuch "maildir.synchronize_flags" to actually reflect the unread status into your Maildir. Stefan