I haven't yet tested it extensively, but I bought Printmaster, an OS 9 program that seems to work just fine in OS X (at least it did in Jaguar), for only $4.
When I had a PC, I used Printmaster extensively. It has some excellent clip art, and it is a pretty decent home publisher. It even has alignment guides!
As cheap as it is, you won't risk much by trying it. I just did a Google search for "Printmaster Mac" (without the quotes) and came up with a gazillion hits. It's available.
Doug