A new option in iGoogle’s chat widget noticed that takes you to invite friends to Google Talk. page that provides a simple way to import your contacts from Yahoo Mail, Hotmail, AIM and send mass invitations. The problem is that Google asks the username and password for a third-party email account, instead of using the APIs provided by Yahoo and Microsoft.
Have you ever been on a web-site that asked you for your Google username and password so that it can import your Gmail contact list? Did you think twice before giving out that information, hoping the web-site would not use it to access your credit card information stored with Google Checkout? Now you don't have to! We're happy to announce the availability of our Google Contacts Data API that gives programmatic access to your contact list. (...) We hope that APIs like this one mean you will never have to give out your username and password to other sites again. Please encourage all sites you use to switch to this API for accessing your Google contact data.
Source:→ Google System