Google is conducting a survey which allows you to suggest features for gmail and orkut. If you want to suggest something for orkut then you can go to the suggestion page where you can suggest some of the pre listed features, or you can go to the discussion page of orkut help group  where you can post your own ideas’. For suggestions regarding gmail you can go to gmail help center page where you can choose 5 features from a given list of features and if the feature you want is not on the list then you can go to the “i have a better idea section” at the bottom of the same page.