Flickr - Click on content to edit field.
/via heylookspencer

Flickr - Click on content to edit field.

/via heylookspencer

Drifter theme - Search button turns into search field once you click on it. 
/via Andrew

Drifter theme - Search button turns into search field once you click on it. 

/via Andrew

Typinator - Menubar icon dims when you activate password / security form fields.
/via perfectlyshapedworld

Typinator - Menubar icon dims when you activate password / security form fields.

/via perfectlyshapedworld

Apple - Signup form shows a lighter version of input description once you clicked on. Then once deselected the blue border subtly fades out.

Apple - Signup form shows a lighter version of input description once you clicked on. Then once deselected the blue border subtly fades out.

Google Reader - Search filter drop down turns into a form field

Google Reader - Search filter drop down turns into a form field

Tumblr - while creating new blog the form field is already filled in and your entry aligns to the right of the form
/via @fabianmu

Tumblr - while creating new blog the form field is already filled in and your entry aligns to the right of the form

/via @fabianmu

Twitter sign up password form

Twitter sign up password form