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Do not reveal personal information inadvertently. You may be "shedding" personal details, including e-mail addresses and other contact information, without even knowing it unless you properly configure your Web browser. In your browser's "Setup", "Options" or "Preferences" menus, you may wish to use a pseudonym instead of your real name, and not enter an e-mail address, nor provide other personally identifiable information that you don't wish to share. When visiting a site you trust you can choose to give them your info, in forms on their site; there is no need for your browser to potentially make this information available to all comers. Also be on the lookout for system-wide "Internet defaults" programs on your computer (some examples include Window's Internet Control Panel, and MacOS's Configuration Manager, and the third-party Mac utility named Internet Config). While they are useful for various things, like keeping multiple Web browers and other Internet tools consistent in how the treat downloaded files and such, they should probably also be anonymized just like your browser itself, if they contain any fields for personal information. Households with children may have an additional "security problem" - have you set clear rules for your kids, so that they know not to reveal personal information unless you OK it on a site-by-site basis?

Hollywood, needless to say, isn't a fan. The Motion Picture Association of America describes Megavideo and Megaupload as copyright scofflaws and said that they host illegal content "at their own peril." Maybe, but these sites, registered in Hong Kong, seem to know how to avoid lawsuits. They are following at least the letter of the Digital Millennium Copyright Act, removing infringing material at the copyright holder's request.

In a 1992 decision, Quill v. North Dakota, the U.S. Supreme Court ruled that retailers are exempt from collecting sales taxes in states where they have no physical presence, such as a store, office, or warehouse.   (The legal term for this physical presence is "nexus.")    Although the case dealt with a catalog mail-order company, the ruling has subsequently been applied to all remote sellers, including online retailers. The Court said that requiring these companies to comply with the varied sales tax rules and regulations of 45 states and some 7,500 different local taxing jurisdictions would burden interstate commerce.

In a 1992 decision, Quill v. North Dakota, the U.S. Supreme Court ruled that retailers are exempt from collecting sales taxes in states where they have no physical presence, such as a store, office, or warehouse.   (The legal term for this physical presence is "nexus.")    Although the case dealt with a catalog mail-order company, the ruling has subsequently been applied to all remote sellers, including online retailers. The Court said that requiring these companies to comply with the varied sales tax rules and regulations of 45 states and some 7,500 different local taxing jurisdictions would burden interstate commerce.

It disadvantages local businesses.  Exempting online retailers from having to collect sales tax, as regular stores must, gives these companies a 4 to 9 percent price advantage over local stores — a sizable competitive advantage in retailing.