• In a move that could deal a huge blow to computer security vendors, Microsoft is set to launch its free Security Essentials suite on Tuesday. It's a replacement for the paid-for OneCare product that Microsoft used to sell - but the question that companies like McAfee and Symantec have said it won't be a major competitor.
• The decision by Apple to re-hire Michael Tchao - who previously worked on the Newton handheld back in the early 1990s, but has more recently been working on Nike+ - has created some interest, not least from the New York Times. Speculation, logically, tends towards a possible role in marketing tablet computer. But really, given that tablets have been entirely underwhelming for years, does Apple think marketing is the missing piece of the puzzle?
• If you haven't seen this video tribute to the astronomer and pop-sci advocate Carl Sagan then you're missing out. Keep your eyes peeled at around 2.20, when Stephen Hawking makes a special appearance.
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