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Here is a list of alternatives to Wall Wisher

"With photos, videos, and music files clogging up your hard disk, it's harder than ever to keep it clean, trim, and free of duplicates. Use Fast Duplicate File Finder, though, and you'll be able to find duplicate files with ease, and keep your hard disk in tip-top shape. Fast Duplicate File Finder doesn't merely compare file names or file sizes; it does a file comparison at the binary level. This is particularly important when looking for music, video, and other media files, because you may have files with two different names, which are otherwise identical. It's got plenty of nice-to-have features, such as determining whether to delete duplicates or move them to the Recycle Bin or a custom folder; the ability to preview files before deleting them; and support for removable media such as USB drives. Fast Duplicate File finder is simple to use, goes about its work quickly, and it's free. It's this simple: If you're looking to trim your hard disk by deleting duplicate files, it won't lead you wrong. "

A nice collection of videos to help explain Creative Commons to educators and students.

Using Posterous and Audio Boo for podcasts posted to your blog. All for free.

" Today we're making it a little easier for users to quickly type equations using LaTeX equation shortcuts. For anyone who heard of LaTeX before, it's a document markup language that's often used by academics to quickly type out complex formulas. In Google Docs, when you're inside an equation you can type '\sqrt' followed by a space or a parenthesis to automatically convert the text into a square root sign √. Other examples of useful shortcuts are '\frac' for a fraction and shorthands like '\epsilon' for Greek symbols."

"With Google Docs, we're always trying to make you more productive-and part of that means making it possible for you to get things done from anywhere, at anytime. That's why we're excited that the new documents editor now supports editing on your mobile browser. We're rolling this out over the next few days."

"At first glance, the winning images from the 2010 Olympus BioScapes Digital Imaging Competition--put on by the camera company's U.S. arm--look like distant worlds or psychedelic moon landscapes. But take a (much) closer look, and you'll see the images are of life science specimens that surround us every day: seeds, insects, plants, animals, and eyes... "

Google Apps lesson plans. Choose by Product, Subject, and/or Grade Level.