Hey Betsy,
Yes, you should use the issues as a to-do list, and yes, you're quite right that it's a little out-of-date. I'll take another pass through tonight and try to clean up anything I can find. It's also an incomplete list, unfortunately. In addition to a few open tickets that have been resolved, I'm sure there are outstanding tasks that don't have tickets yet. And to be perfectly honest, I don't have a 100% accurate mental picture of what's finished and what isn't. Such is life when you don't have a dedicated PM.
I'll try to clean it up, and if you find anything else that seems wrong, leave a comment on the ticket and I'll check it out. Feel free to pick up any tickets that were assigned years ago and untouched. Anything that was assigned this year, we'll give the owners a little more time to work on :)