Andy,I agree with you 100%. All the books for chromatic harmonica instruction essentially suck. There is nothing I can recommend in good conscience. The reason you see all the same silly songs in print (for all kinds of instrument instruction) is because the publishers don't have to pay anything to use them as they are no longer in copyright.
I am smack dab in the middle of doing the background work to create video and more audio for the site. As you know I've said, I will add more chromatic instruction and songs and scales to this site, but the other stuff I'm doing now is higher priority.
Did you ever pick up the Jazz Harp book by Richard Hunter. It is for diatonic and chromatic, but has a few Stevie Wonder solos tabbed out and some scales-
http://www.amazon.com/exec/obidos/ASIN/0825602297/ref=nosim/harmonicalessons
As always, feel free to post your questions here and if you need some specific help with scales or improv theory, please request it and it could become the beginning of me getting the content together for the website. I am willing to do a continual dialog here for you with chromatic info and instruction. Do you have the scales that are already on the site memorized yet? This is the first place to start.
Another thing you need to do is memorize the note location on the chromatic. Every 4 holes on blow you get "C E G C" and on draw you get "D F A B". This configuration starts on holes 1, 5, and 9. If I asked you what hole 6 draw with the slide in is, you should be able to come up with "F#" (an octave and a half above middle "C").
Also, did you see this yet? Scroll to the bottom for chromatic topic links-
http://www.harmonicalessons.com/members/dcforum/DCForumID1/318.html
Play on,
Dave Gage