iContact is a free application for Windows that allows you to access your Gmail contacts whenever you need them without logging into your Google/Gmail account.The main advantage of this free application is its integration with other applications like email client, Skype or Google map. For example, you can make a phone call with Skype or place a contact on the map through Google Maps in a single pair of clicks and all without leaving iContact.
This newborn application is still in an early development stage and may be have some small bugs, but the application indeed very useful. [Source]