here [link|http://news.bbc.co.uk/1/hi/sci/tech/1334582.stm|http://news.bbc.co.u.../tech/1334582.stm]
"Winkler says his "Gekkomat" is an advance on previous suction devices because it will work on any type of surface - even those made from porous materials like plaster and concrete. " this is the latest prototype
thanx,
bill