Here's a set of useful bits and bobs to make your powerpoint presentation heaps better.

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Find postcodes easily.

The h2g2 (Hitchhiker's Guide to the Galaxy) site invites you to write an entry about anything you like. It is an encyclopaedic project contributed to by people from all over the world. Anyone can write for the Guide and collaboration is encouraged - users help one another, feeding back on what others have written. The result is a guide that's constantly being updated and revised, driven forward by the people who use it.

Correspondence deserving of a wider audience.

• The total number of letters has declined 1.6% year on year. Between 2004-5 and 2005-6, Royal Mail's profits from letters fell by a third.
• A third of 16- to 19-year-old girls had never written a letter, while among boys, the figure was over a half.
• The advent of email - not to mention texting, instant messaging and social networking - has undoubtedly played much the biggest role in the fate of the letter
• Biographers use letters to find out about their subjects. This isn't possible with emails.
• A first class stamp costs just 39 pence
• W H Auden's poem The Night Mail is about a train that delivers letters. The final lines are "Who can hear the postman's knock and feel himself forgotten?"