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PDF plugin for Firefox 3 on Mac OS X. Displays PDF documents in the browser

Double click on a tweet to view not only that tweet, but the entire conversation history leading up to that tweet. Never lose track of a conversation again. Independent compose windows stay out of your way until you need them. Have as many open at a time as you'd like while you compose your thoughts. Everything has a keyboard shortcut, (Command-Enter will send a tweet).

Most new consumer Macs come with a built-in iSight camera which can be used for all sorts of fun from video chatting in iChat, horsing around in Photo Booth, to third party apps like Gawker. Despite these fun and harmless uses, there are some security concerns with having a built-in camera particularly in academic and institutional settings, and because of this some System Administrators have taped covers over the iSight and even removed them from the machines entirely. Thankfully, there's a much easier way to disable the built-in iSight camera, all you have to do is move a file.

Adium is a free instant messaging application for Mac OS X that can connect to AIM, MSN, Jabber, Yahoo, and more.

The European Mac OS X training camp, in conjunction with Amsys and Agnosys has had its most successful year to date with a large number of newly qualified Apple Certified Support Professionals.

John Detroye has posted his latest write-up of tips and tricks for managing Macs.

Mac OS X v10.6 Snow Leopard includes QuickTime X which comes with a new QuickTime Player, offering a clean and uncluttered interface, easy media sharing, and flexible recording capabilities. Should you need it, a Snow Leopard-compatible version of QuickTime Player 7 is also available for use with older media or with existing AppleScript-based workflows. QuickTime Player 7 can be used to playback formats such as QTVR, interactive QuickTime Movies, and MIDI files. Also, it supports QuickTime 7 Pro registration codes for access to QuickTime Pro functionality.

Mac OS X only: GeekTool is a nifty utility that incorporates text files, the output of shell commands and images onto your Mac's desktop. GeekTool ranks up there with Quicksilver in my "Oh my God, why doesn't this exist for Windows" list. Especially indispensable for command line lovers, GeekTool is fantastic for keeping tabs on your system or tracking your life in .txt right on your desktop.

GrandPerspective is a utility application for Mac OS X that graphically displays the disk usage of a file system.

WhatSize allows you to quickly measure the size in bytes of a given folder and all subfolders and files within it. You would be surprised at how many useless files might be laying around on your hard disks. The files and folders are automatically sorted by size, with the biggest sizes first. WhatSize helps find out what files are taking up all of that space.

Propagator provides a GUI for pushing out files to Macs on your local network. This is useful for OS X system administrators who wish to update all of their managed client machines with a specific file, most commonly property list (.plist) files. This functionality can also be achieved using Apple Remote Desktop, but a free alternative is always worth taking a look. My two favorite aspects of Propagator are its Common Places drop down menu for quickly specifying common locations to drop files (such as long ~/Library paths), and it's Set Ownership check box for giving proper ownership of the file to the right user accounts. The option to Lock Files After Copy prevents users (in my case, students and unknowing faculty) from messing with your work, accidentally or not.

Dock icons are a quick way to bring a hidden window or application to the front so that you can work with it again. Dock icons are odd ducks - they're activated with a single-click. Most icons are selected (highlighted) when you single click and opened when you double-click. So Dock icons are kind of like links on a Web page - you need only a single click to open them.

Apple has removed a widely publicized support document from its website that encouraged Mac OS X users to install antivirus software, explaining that its operating system was designed with safeguards to protect against malicious attacks on its own.

The more things change, the more they stay the same. That's what I thought watching coverage of Apple's Worldwide Developer's conference opening yesterday, where banners that read things like "Hasta la vista, Vista" and "Redmond has a cat, too. A copycat" hung.

Mac OS X Server makes it easy for groups to collaborate and communicate through their own Wiki powered internet website. See how easy it is to administer a wiki