Do you use the same web browser at home and work? Do you want your web browser's "home" button to take you to different places when you're in different places? If so, MyHome is for you - but the best thing is you don't have to reconfigure your browser or install any software.
Add new home
The IP address/netmask can either be a single IP - which by default is set to what the web server thinks is your current one () - or a netblock if there are a range of proxies you come through, eg. 62.253/16 covers NTL's transparent proxies. You can use 0/0 as a default which is always checked last, no matter where it appears in the list above.
If in doubt, just leave the IP section as is.