I agree, as much as I'd love to see more people using cloth I don't feel it's my place to try and convert them, and I certainly wouldn't appreciate someone trying to persuade me to use sposies.
I normally make sure I change DD somewhere fairly public, with my prettiest nappies and answer any questions that people have. DD is in wool 90% of the time now so I get lots of comments and compliments on her clothes, whenever anyone says anything about them I explain it's because she is in cloth napies and that is her nappy cover - but most people aren't interested enough to ask anymore unfortunately.
I do know of one person who has switched to cloth recently after seeing my DD in wool, but I think she was always wanting to do it and just needed some help (she's on here now too ) otherwise I tend to just give people the phone number of the local nappy lady, or send them a link to this site, and then just let them make their own mind up.
I am trying to convert a friend to wool at the moment though, as she's already using cloth and PUL wraps, but has been having problems with nappy rash and has gone back to sposies. All I'm going to do is lend her a couple of wool soakers though and explain how to use them.
I actually have 5 friends with babies in cloth out of my immediate circle of NCT Mums - which I think is great, though they are all very good and just use LL or Sandys etc!! - not as addicted as me!