Awesome. You forgot Treasure of Talon Pass (which is level 2, Free RPG day module on WotC site) and that's not even touching promo material (Into the Shadowhaunt) or RPGA/Living Realms modules.
What level was
Into the Shadowhaunt? (I'm assuming 1st, but I wanted to be sure). I forgot all about those. When I clean it up, I'll update it. I don't think I'd include the RPGA stuff though, not everyone has acces to them (including yours truly). But then again, not everyone has access to
Dungeon either.

Where could I find a list of the RPGA adventure titles and their starting levels (and level span if available)? Maybe I can add them on a seperate chart?
Not to derail, but thanks everyone for the feedback. I didn't think it was a very good chart, I just threw together a rough one to get a visual of where the level distribution was. But, I could make a cleaner version and keep it updated. Where would be a good place to keep it linked for everyone?
One of the problems I had with it is that 4E adventures don't tell you how many levels the group should advance through the course of the adventure. On the chart, the level span is more based on a guess and the length of the title text, then on actual progression. If anyone knows what the level span of the published adventures is supposed to be (or how to figure them out), that would help?
I don't play 4E myself, but I find adventures to be fairly easy to convert from system to system. There are a couple of 4E adventures I'm planning on using in my current campaign. As long as I've got the plot and story down, the stats are easy (I can even just wing them most of the time, my players don't even notice). But, I can see how this chart could help in planning out a 4E campaign.
Anyways, thanks everyone. I'll work on cleaning it up a bit.