I understand that the distinction between licence and license can be hard to remember, especially since it varies between Australian and US English. I'm a lot less sympathetic to people who write "I advice you" when what they mean is "I advise you".
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Advice is a noun. Advise is a verb. This remains true in all varieties of English. So "I advise you" is fine, "I advice you" is meaningless gibberish. And yet a casual Google search shows up nearly 4.7 million. examples of this phrase. It's particularly common on forums. I appreciate that these are casual environments, but if you form sloppy habits, they tend to stick.
Be wise, use advise when you need a verb. Accuracy matters.
Lifehacker's Mind Your Language column offers bossy advice on improving your writing.