The Daily Mirror has picked up on a poll carried by moneysupermarket.com which suggests that one in nine people have 'hijacked' someone else's Wi-Fi connection (i.e. used it without permission) and that something like one in six households are running an insecure wireless network.
The law takes a dim view of borrowing someone else's Wi-Fi connection unless you have permission to do so with a few cases making it into the news. Interestingly while the article in the Mirror suggests half of those who had borrowed a connection had looked at a person's emails the original article by MoneySupermarket is less sensationalist by revealing that actually around half of those borrowing a connection use it to check their own email.
If you have a wireless router, there are several things you can do to improve security and stop others abusing your Internet connection:
The www.getsafeonline.org website covers online security in an easy to follow manner and as always our forums are a good place to ask questions about the areas that have you confused.