Do you remember when you first used this password at LinkedIn? It could help narrow the dates of the breach. Especially useful would be the presence of a strong password in the list that was subsequently changed. That might help determine its freshness, if the new password isn't present (although this may be an incomplete list from an ongoing breach).
I'm thinking this list is from closer to a year ago, I changed my password shortly after the MtGox hack last year and this hash is for my old password that was compromised during that time period.
It was about a year ago now. I checked the hashes for my previous password and it wasn't on the list... Mind you, as many have noticed, it seems to be very incomplete.
