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When open windows start piling up on your desktop, Mac OS X Leopard provides a great way to establish control. Spaces. How can Spaces help you get more organized? Find out by reading the latest Pro Tip of the Week.

As a scientist, your Mac can be a valuable asset, especially when it comes time to share your research findings with colleagues. To find out how you can use tools on your Mac to create research posters, websites, and dynamic presentations, visit the Science Productivity Lab, where you’ll find tips and tutorials created with the needs of the scientific community in mind.

THE WAR, the most watched PBS series in the last decade, now serves another tour of duty as an excellent online educational resource. WETA, Washington D.C.’s public broadcasting station, provides film clips, lesson plans, and additional educational resources for students and teachers. Watch — and enjoy — them today on iTunes U.

“Sales of Apple’s Macintosh computers have been growing much faster than PC sales overall, with many new Mac buyers switching from years of using Windows computers,” admits Walt Mossberg (allthingsd.com). And to help those who have made the switch, he’s assembled “a quick tip sheet explaining a few of the most common differences” between Mac OS Leopard and Windows.

Thanks to a new educational initiative, teachers and parents can now access a wealth of K-12 educational curricula on iTunes U. Delivered by state and district agencies in Arizona, Florida, Maine, New Jersey, Pennsylvania, and Utah, the free content provides “global access to educational content, curricula, learning materials, news, best practices, and other resources,” reports Dave Nagel (thejournal.com).

Ever wished you could drag the contents of one PDF into another? You can — using Preview in Mac OS X Leopard. We show you how in the latest Quick Tip of the Week.

Aperture 2: Professionally Manage Digital Photographs, a new title from Ben Long, Richard Harrington, and Orlando Luna, guides you step-by-step through the entire Aperture workflow, even providing hundreds of sample images to experiment with. Download the free Aperture 2 trial, work through the book’s in-depth tutorials, and you’ll see how far Aperture 2 can advance your photography.

Get Smart introduced us to Bruce and Lloyd. Now the two, played by Masi Oka (Heroes) and Nate Torrence (Studio 60 on the Sunset Strip) appear in their own film: Bruce and Lloyd: Out of Control. A hilarious treat for the holiday weekend, it’s available online exclusively on iTunes for purchase or rental. Enjoy.

Bob LeVitus (Houston Chronicle) considers the 17-inch MacBook Pro “the fastest, most powerful, and most capable notebook I’ve tested.” And he’s particularly taken with its display. “All I can say is, ‘Wow.’ With its bright, deeply saturated colors and rich, dark blacks, full-screen HD video is mind-boggling.”

Of three ultrathin portables — MacBook Air, Toshiba Portege, and Lenovo ThinkPad — which is the most usable? To find out, Computerworld turned to usability experts and 20 impartial testers. Those testers, David Haskin relates, found MacBook Air the most usable, the most fun, and the best value of the three. In fact, they made MacBook Air “the clear winner when asked which laptop they’d purchase.”