Sunkast's pick: Online Convert
Online Convert lets you convert media easy and fast from one format to another for free. The web site supports many formats including video, images, audio, document, and ebook conversions. No registration is needed to convert a file. Online Convert even easily converts your videos to popular phone formats such as iPhone and Android. You can also purchase premium service if you need higher upload limits and higher priority conversions.
To get started for free, go to http://www.online-convert.com
Erik's pick: Lion Disk Maker
Lion Disk Maker is an application programmed with AppleScript that you can use with Mac OS X 10.6, 10.7 and OS X 10.8 to burn a DVD or build a bootable drive from Mac OS X Lion or OS X Mountain Lion Installation program. As soon as you launch the application, it tries to find the OS X Install program with Spotlight. Then, it proposes to build a DVD or create a bootable install disk.
Get Lion Disk Maker for free at http://blog.gete.net/lion-diskmaker-us/
Andrew's pick: TonyMacx86
TonyMacx86 is a web site popular among hackintosh builders. Hackintosh is the term given to those that create Mac OS X computers from non-Apple hardware. TonyMacx86 provides a ton of useful information for building a hackintosh including guides to building a hackintosh, installing Mountain Lion, hardware recommendations, tips, and DSDT files. The site also has articles and videos to help you along. And if you need help or advice, their forum is a great place to go.
Check out TonyMacx86 at http://www.tonymacx86.com
