There's a great website, The Daily SuDoku, with a new printable puzzle every day. You can also print out the archived puzzles. They even have a Sudoku for kids page with easier puzzles, and downloadable blank grids in PDF.
You can have puzzles emailed to you each day, or subscribe to the RSS feed. Or you can check back here each day, because I've embedded the HTML code that will display their daily puzzle right here on the EdTech Update (with their permission of course!)
But wait! There's more!!! If you would like to try Sudoku on your Palm handheld computer, there is a freeware version (although the developer is accepting donations) available from Andrew Gregory's website.
Visit http://www.dailysudoku.com/ for more puzzles, solutions, hints, books and other resources.