No, you can't. This is no different than taking content from another website and putting it on your blog. Copyright infringement, 100%, without a doubt.
BOTH OF THESE ANSWERS ARE WRONG! DO NOT LISTEN TO THEM!!! Under copyright laws YOU CAN NOT COPY SOMEONE ELSES ARTICLES to your own blog with out their express permission. Fair use clauses of copyright laws basically only allow a brief summary/description of an article and links to said article. International copyright laws also apply to over 100 countries world wide. For a related legal case see http://www.law.uh.edu/faculty/cjoyce/copyright/release10/LosAngT.html (L.A. Times v. Free Republic)
You beat me to it. KLB is absolutely right. It doesn't matter if you credit the author or not, you cannot arbitrarily just yank content and use it for your own purpose without express consent.
With caveats, yes. Your article must be substantially unique. Simply changing the order of sentences, using synonyms, etc. could still get you in hot water and is plagiarism. You should also provide appropriate references.
Best is to write to the magazine and ask for the reprint rights. One page in a magazine may be the whole article. If you quote a paragraph and point back to the source, it may not be too bad as long as you also credit the source.
If you change a few words and/or write it in your own words...or treat it as a refrence material, then you can get away with it. For instance, i can legally put up conan o'briens 10 things, and critisize it in the post. The trick is that you have to have the majority of the article being original content. Also, always site your sources, else you get nasty calls at 3am asking you to take that one picture of ronald regan in a thong down..... Read up on fair use. It pretty much only applies on educational uses. My brother is a IP lawyer, and we have been talking about this for almost 2 years. Alot of people break ip law, far more then get in trouble. Where it bites your ass, is when your site gets big, and some corperate jerk see's the article.....then he sues you and takes your site.