I fiddled with this one a couple times since I first posted it.

The fonts are Yikes and Century Gothic.  Both fonts are free for private or commercial use, which is important since I want to sell this eventually and it’s always nice if I don’t have to worry about licenses.  The larger one is an example of what you can do with text along a line.  And then I fiddled with layer effects to get this look.  I didn’t actually warp the text.  I just upped the font size a bit on each letter as I went around the spiral.