After the upgrade from Tiger to Leopard, keychain cannot save or modify passwords anymore. The only way I can resolve this issue is to reset my keychain by running Keychain Access app, then go to Preferences -> Reset My Keychain.
Webomatica and MacFixit have mentioned other ways to fix common problems on Keychain.
Prior to working on Stepcase full-time, Leon Ho was Manager of Software Engineering at Red Hat, responsible for the internationalization deliveries in Red Hat products. Leon managed a team across regions in Australia, Japan, China and India. Leons division added support of 22 languages in Red Hat Enterprise Linux and migrated new internationalization technologies into products. He founded Stepcase's Lifehack in 2005, a blog on productivity and personal development, which became #40 most popular blog in the world. Stepcase has been featured by major medias such as Time Magazine, BusinessWeek and Hong Kong Economic Times.
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