Today, 6.5million LinkedIn password hashes leaked. These hashes are unsalted SHA-1 hashes and can be found online. If you happen to have the file lingering around, use
grep "yourhash" combo_not.txt to check your hash is in it. Also check with the hash in which you replaced the first 5 characters by 00000.
If you’re not savvy enough, or don’t have the list, you can use LeakedIn
My old LinkedIn password was in the list (I changed it about a month ago). Best is to change it now, and change it again after LinkedIn has fixed the hole. Also, it’s — again — yet another reason to use different passwords for each site on the internet.