New features with Gmail contacts and spreadsheets

Gmail Contacts
Gmail will now automatically adds people that you corresponded with to 'Suggested Contacts'. You can move people you correspond with regularly to 'My Contacts'. Gmail's address auto-complete feature will work for all of your contacts, whether they're in 'My Contacts' or 'Suggested Contacts'.

To ensure that only the right contacts are synced with your mobile device in the future, Gmail has moved previously auto-added contacts in 'My Contacts' back into 'Suggested Contacts'. Only contacts that you've moved to 'My Contacts', edited, imported or added to a group will remain in 'My Contacts' for syncing.

Full screen for Google spreadsheets
Google Spreadsheets now lets you view more of your work on-screen. Ctrl+Shift+F toggles between three modes: hide header, hide header and toolbar, and show all.