Financially strapped Sirius XM Radio Inc. said that it could file for bankruptcy as early as Tuesday if it can't renegotiate its debt.

• Microsoft to open retail stores

Federal regulators issued new guidelines for Internet companies that track user behavior online and then tailor advertising. Verne Kopytoff

Silicon Valley legend Bill Joy is trying to figure out how to use technology to solve intractable problems like global warming. Deborah Gage

Russia's Mission Control chief said that even tiny fragments pose a serious threat to spacecraft made of light alloys because both travel at such a high speed.

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A kiss may be just a kiss, but now you can send one online to your sweetie. Anastasia Hendrix

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• Txtng + dating = :(