It's called Puzzazz, and the name says it all: puzzles with pizzazz.
Software engineer and longtime puzzlemaker Roy Leban founded Puzzazz on the theory that, like so much else, puzzle delivery and enjoyment will be an increasingly electronic rather than paper-based phenomenon. He's a true puzzle lover whose first priority is to provide high-quality puzzles, using technology to make the experience that much better.
For example, Puzzazz is pioneering the publication of puzzle books for devices like the Amazon Kindle. E-books offer numerous advantages over traditional books: electronic puzzles can be wiped clean and re-solved where paper puzzles can't; built-in tools can enrich the solving experience for logic puzzles like sudoku; hinting and error correction are more fluid; solvers don't have to draw the unusual symbols that some puzzles require; and the books themselves are more portable.
Puzzazz is a puzzle publisher, not a gamemaker, as this article from TechFlash makes clear. Its thoughtful incorporation of technology may be an early glimpse of where textbooks and other traditional print media are headed.
The company also generates content for non-Kindle people like me. Puzzazz.com posts a new word puzzle every day, which they also distribute by email and RSS feed.
I particularly like their "logic crosswords," small crossword puzzles in which you have to figure out not only the answers, but where they fit into the grid.
For example here's a 4x4:
And a "5&3":
Both puzzles reprinted with permission of Puzzazz.
There are a couple of 4x8 logic crosswords in the March Puzzazz newsletter. They're harder than these. Can you finish them?