I was on vacation for the release of Leo, so I’m a little late for the final compatibility scorecard. As far as I can tell:

• Notae runs fine in Leopard. I’ll do some more testing to make absolutely sure every feature works well, but I’ve been checking all along and nothing’s obviously broken.
• My CUPS-PDF distribution does not work in Leopard. I’m sure it’s something simple and I’ll look into it soon.
• Text Reader and Launchd Editor have not been tested in Leo, but I expect no problems as these are very simple programs.

I’ll look into this more this week and see if anything needs to be done.