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If Time Machine gets disrupted for any reason during a backup (ie. hard drive unplugged, power failure) it seems to get stuck. Occasionally it gets stuck for reasons only known to Leopard. Its a known bug on the Apple discussion boards. What has worked for me is the following:1. ensure hard drive is powered on and connected to computer2. turn off time machine3. go to your backup volume, backups.backupd, "your computer name", and then select and trash "In Progress" or "Latest" (it will be the last one in your backup folder listing)4. turn Time Machine back on5. either wait for the next backup cycle, or what I do to be sure things are working right is force an immediate backup (control-click on TimeMachine, select "backup now").

Tim Berners-Lee, inventor of the World Wide Web and director of the W3C, has said it best: “Anyone who slaps a ‘this page is best viewed with Browser X’ label on a Web page appears to be yearning for the bad old days, before the Web, when you had very little chance of reading a document written on another computer, another word processor, or another network.”

Methodologies including layered development via progressive enhancement, Unobtrusive Javascript, and Hijax ensure that higher layers don’t disrupt lower layers. However, representative testing of the core experience is critical. If you choose to adopt a Graded Browser support regime for your own web applications, be sure your site’s core content and functionality is accessible without images, CSS, and JS. Ensure that the keyboard is adequate for task completion and that when your site is accessed by a C-grade browser all advanced functionality prompts are hidden.