If you've found yourself out of work due to the recession, why not try a career in double glazing? Long held as the ubiquitous cold call in the middle of preparing dinner or watching your favourite tv show, some people can be actively hostile to the thought of a double glazing sales pitch. This is slightly bizarre as nearly everyone has bought at least one set of new windows over the last 15 years, so it's not like their services are unwanted. Admittedly, as the number of people who can afford windows reducing all the time, selling double glazing may be getting harder, but a commission is a commission so decent money can be made.
If you're not in to the idea of selling double glazing then you could always learn to fit it instead. Unlike the salesmen seeing their pool of potential customers reduce over the years, double glazing will still be installed in new homes or in renovated commercial buildings. Although the building industry in the UK has taken a little bit of a dive recently, it will have recovered by the end of 2010 and people will be needing window fitters again.
The only real potential obstacle to the current window industry is the environmental concerns over the materials used to produce them. Although they undoubtedly help save the environment through reducing heating costs, when the oil runs out it will be back to wooden frames for good, which generally are too weak to support two panes of glass.