when the newer versions come out, is it like windows where you have to do a complete reinstall and get all the apps again, or do they do upgrade options?
It varies from distribution to distribution. Ubuntu usually lets you do a distribution upgrade without having to reinstall. But some, like Fedora Core I think, will make you reinstall the whole OS. Others don't even have new versions, like Arch which just works on a rolling release.
It's not that big of a deal anyway if you've got everything backed up.
Yeah usually, unless you've got a custom kernel most stuff will just work in another PC IIRC. This is why Linux is so great for USB drives (obviously this depends on architecture; you can't put a 64-bit install in an x86 machine)also, due to there being no registry, can you just unplug the linux hard drive and stick it in any other computer and your up and running?
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