Well, in 2010 I've only done little changes. The real development on this was in 2009. What's the policy in these cases? I believe I can put the 2010 safely.
I have seen people adjust the years for simple fixes, although I don't know if there is a formal policy. Since your patches are going in now I guess anything from "2009", "2009, 2010" to "2010" is warranted.
Since most countries don't require a copyright notice any longer(although still recommend it) I guess there is no real legal significance to the year. In most places copyright expiration doesn't depend on the publication date but on the year of the death of the last surviving creator.
IANAL, somebody who knows this better please correct me.
I thought that AJ only wanted a copyright notification if significant contributions were added. As to the date the format 2009-2010 would be most suitable in this case.
James McKenzie