What is the best way to share an internet connection on a home lan?

On August 13, 2004 the ISP Wanadoo (formerly Freeserve and now Orange SA in the UK) were told by the Advertising Standards Authority to change the way that they advertised their 512 kbps broadband service in Britain, removing the words "full speed" which rival companies claimed was misleading people into thinking it was the fastest available service. In a similar way, on April 9, 2003 the Advertising Standards Authority ruled against ISP NTL, saying that NTL's 128 kbps cable modem service must not be marketed as "broadband". Ofcom reported in June 2005 that there were more broadband than dial-up connections for the first time in history.. In the third quarter of 2005 with the merger of NTL and Telewest, a new alliance was formed to create the largest market share of broadband users. This alliance brought about huge increases in bandwidth allocations for customers (minimum speed increasing from the industry norm of 512 kbps to 2 Mbps home lines with both companies planning to have all domestic customers upgraded to at least 4 Mbps downstream and ranging up to 10 Mbps and beyond by mid-2006.) along with the supply of integrated services such as Digital TV and Phone packages.