[Toadling]

If you look at the 512 pixel version of the icon (perhaps in the Finder's Cover Flow view), it certainly looks like an hPDA with a nice purple, translucent, protective cover with the Omni logo and a simple, white or silver binder clip. I think it's clever, cute, and appropriate for the app and its heritage. Nicely done.

I especially like that it uses purple (or violet?). That's not a common color in my Dock and makes OmniFocus easier to spot at a glance.

As for the text, it looks like Gaelic (but what do I know):

1. <obscured by clip> tusa Shean
2. Conas a ta tu?
3. Taim go maith
4. Sloan abhaile

Followed by a sketch of a triangle with circles at the points.