Quote:
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Steam Guard will allow users to link their accounts to a specific PC. Any attempts to modify or change account settings by any other PC will not be possible without the user’s approval.
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This basically means if someone using another PC tries to change your steam registered email address (so he can then change the password, which requires they click a confirmation link that's emailed to your steam registered email address) they won't be able to unless they can also get access to your PC.
You'll still be able to log in to your steam account from another PC, you just won't be able to change your security related account settings. No doubt you'll be able to assign a different PC as the "secure" one via a confirmation link sent to your currently registered email address, but you won't be able to change anything else until you do that or perhaps there's some other ID measure in place with the system.
Rest assured there will be contingency measures in place regardless.