http://www.macosxhints.com is good i read that all the time.
OS X programs are normally in disk images, so you have to mount them and then copy the program off the mounted disk image into your Applications folder.
And no there isnt anything like add/remove programs, on a Mac you just delete the application file/folder, unless it came with an installer, in which case if you run it again it may have an uninstall option, but they don't always.
Any other questions then feel free to ask.
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