a few? actually there are ALOT. I'm guessing easily well over a hundred before I started deleting. I personally just deleted 20 or more and have been going back every so often and getting rid several of them on old pages. They don't really inconvenience anyone by sitting there locked but they won't be there much longer.
I'd much rather just start deleting stuff but with that comes the “what happened to my post?” post.(which are deleted) Most of the time locked posts will have a link to the original ET :d
I think now people will have a certain amount of time between the time their post is locked to see it before it is just deleted. If a link is given to a previous discussion and the person replies to the old one, the new one will be deleted. Maybe try to keep up and delete them weekly or bi-weekly.
Zack