Google has launched Knol (www.knol.google.com), a new service aimed at people who want to share what they know.
It's a bit like writing a new encyclopedia, except that anyone can chip in. And yes, it's a bit like www.wikipedia.com, but with more control.
Wikipedia allows anyone to edit any page and is constantly fighting off vandalism; Knol gives control over each page to its creator. Other people can contribute and add comments, but the creator decides whether each of these contributions stays or goes.
But what is a knol? It's a page of information on a particular topic.
Google has set up a bunch of sample knols, and most of them are about medical conditions. Want to know all there is to know about urticaria (otherwise known as hives)? There's a knol about it, written and maintained by a qualified dermatologist.
You can add knols of your own. The thing is, they're supposed to be summaries of reliable knowledge. So a knol isn't a place for opinions or daydreaming in public. What Google wants in its knols is facts.
So ask yourself: what do you know about? If there's a particular topic that you know all about, you could write a knol on it.
You can even earn some cash for your efforts. Google allows you to link your knols to an Adsense account, which means that you get a small cut of any advertising revenue the knol pulls in.
Beware, though: since its launch, Knol has come under fire for opening itself up to abuse by spammers, who have already swamped the Google-owned Blogspot site (www.blogspot.com). As long as the spam is kept at bay, Knol might yet prove itself a useful addition to the web.
Interested in catching a glimpse of 1950s American life, never before seen? One photography buff, who develops old films found in junk shops and car boot sales, posts his findings online.
Each roll of film has never been developed - until now - which means not even the photographers, or their subjects, ever saw the images.
Go to www.westfordcomp.com/updated/found.htm and you can browse through dozens of rolls of photographic history. They are a fascinating glimpse into American life in the 1940s, 50s and 60s.
* Giles Turnbull has a web site at gilest.org.