I'm generally against it, but most of the stock Nokia apps do that anyway, and your e-mail/IM passwords are more valuable than RTM. I think you should at least provide a warning somewhere telling people not to use an important password. As we know, all bets are off when someone has physical access to your machine anyway, so I would just go with a warning, and at least obfuscate the password, so that someone just stumbling across it by accident won't see it right away. Maemo's security once you have the tablet in your hands is trivial anyway, but storing non-obfuscated passwords in GConf just seems silly. (I've had to force myself to remember not to look at certain GConf entries before, when friends gave me credentials, but didn't want me knowing them.)