I am also interested in dual sim adapter for my (as yet undelivered) N900. In S60 the dual sims add a small app to Applications folder that allows changing from one to other sim - still not an ideal solution (calls to other number must be redirected prior to changing sims so as to maintain incoming calls), so kind of defeating the purpose! Ideally both sims would be active at once.....like on the asian dual sim phones. This would require some coding I expect. Any coders interested?

PatricSTAR is your kit the 'cut' type or 'ribbon' type? I'm interested to know how it fits? Ta.