When feelings run high, an ill-judged letter can cause as much emotional damage as any dashed-off online posting.

BBC: A Point of View: Mourning the loss of the written word

While technical in nature -- using the word "hydrocarbon" to refer to oil, for example -- the letter depicts a process that failed to detect a potential cause of the disaster.

CNN: STORY HIGHLIGHTS

The absence of senior Tories is likely to be a cause of greater concern to CBI members, some of whom have signed a letter of support for William Hague.

BBC: Tories snub CBI dinner

Some, like Davos regular Bill Gates, lead by example, by giving away their vast fortunes in the cause of poverty alleviation - and as it happens he today has written his annual letter, in which he calls on well-heeled citizens and governments of wealthier nations not to use these tougher economic times as an excuse to squeeze the financial help for poorer nations struggling to become self-sufficient.

BBC: The rich, worried about inequality?