Need to open multiple sites in one go for testing or something?
I migrated ~20 blogs tonight and needed to test them all before and after the migration. Clicking around, typing crap into the address bar for 5 minutes didn't sound too terribly fun to me so I did this:
Put "site1.url | site2.url | site3.url | site4…" in your "Home Page" option. Close options. Open a new window. Bam! Revert when finished. Kind of a no-brainer, but hey.