A long time ago in a galaxy far far away there was a mass converter...
A long time ago, well nearly a year, Bill referred me to a site where the pound to kilogram converter had been taken away as it was so popular it took the server down. Blimey. So, as an experiment to see if this sort of tool gets traffic just by its existence (and Google and time) I popped one on my site... and noted that 'time will tell'.
Indeed time did tell... nobody came and visited me to convert their pounds to kilos so when I ported the site to Joomla Ilet it go as it was not worth creating a new one in PHP.