There are plenty of wallpaper-changing applications out there, and plenty of them can tap into photo sharing sites like Flickr and Photobucket for access to a plethora of images. Still, not many of them are quite as well-connected as Wally.

Even fewer are cross-platform. Wally, though, is happy to share its background-rotating skills with Windows, Mac, and Linux users alike. It’s built using Nokia’s Qt4 framework and supports an insane number of image sources: local and remote folders (via FTP), and popular photo sites like Flickr, Yahoo!, Panoramio, Pikeo, Ipernity, Photobucket, Buzznet, Picasa, Smugmug, and Bing. You can use any combination of sources you choose by adding and removing them on the settings screen.

Customization options are plentiful, from specifying the delay between image changes to tweaking the size of your local image history store. Images from the ‘net are pulled in based on the search terms you specify – and yes, you can shut off Bing’s adult filter if you want to.

Wally is free and open source, and pre-compiled downloads are available for Windows, Mac, and Linux. The project is also mirrorerd over at Sourceforge.

Welcome to your brand new Hotel.Your job is to serve your customers, and to do it quick! Keep them happy and they will tip you well. And day by day improve your hotel.

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Trying to extract clips from a DVD is usually a roundabout process that involves a lot of waiting. Free utility DVD Knife makes it easy to extract clips from any part of your DVD.

Generally, in order to extract a small clip from a DVD, you’ve got to rip and convert the entire movie—or at least a specific chapter—before you can work with it. DVD Knife does away with this lengthy process with a quick, four-click solution. When you start it up, you just open the disc, navigate to and mark your start and endpoints, and click save. DVD Knife will extract the clip (without compressing or decompressing) into a small VOB file that you can then convert into whatever file type you need, giving you more time to actually concentrate on the goal at hand (or to finish up that project quickly and go do something else).

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When you’re tinkering, especially on a project with tiny screws, it can be intensely frustrating to have a screw disappear into the carpet or inside your project. Temporarily magnetize your screwdriver with this simple trick.

Instructables user Larry SDonald found that magnetized screw drivers were handy but they have the downside of being unsuitable for working around magnetically-sensitive equipment. His solution to the problem—rather than buying duplicates of all his tools in magnetic and non-magnetic models—was to simply attach a small neodymium magnet to the shaft of non-magnetic screw drivers to impart a temporary and powerful boost.

Once you remove the magnet the magnetism dissipates and the tool is rendered non-magnetic again. Have your own handy tool hack? Let’s hear about it in the comments below.