DAEMON Tools for Mac
Excellent virtual CD/DVD drive emulator
Hawkscope is a Java based application that aims at increasing your productivity by allowing you to access your hard drive contents via a menubar icon with a dynamic pop-up menu. Hawkscope enables you to access a dynamic pop-up menu that allows you to find your files and folders without touching Finder or double clicking folders. Just move your mouse cursor to the Hawkscope icon in your menu bar and the menu with all your folders and files will pop-up.
Want to access your music for example? Just move your mouse cursor over the Hawkscope logo, select your user folder and your music folder appears without a click necessary. All of your major drives and folders are instantly accessible. However, the only problem you may encounter is if you have to access networked drives. It takes Hawkscope a while to map the location of the drive and during this time, you can't browse anything else effectively "locking" the program.
You can add a blacklist of folders that Hawkscope should not access from the options menu and that's your best bet for avoiding this problem.
Hawkscope is an interesting way to avoid using Finder and obtain instant access to your files and programs although I won't be dumping finder quite yet.