PressThis: Mainly intended for clients, The "Press This" function allows quick posting and publishing through the use of a special web browser favorite. 

Categories and Tags Converter: Use this to access the Tools Import Screen. Here, content can be imported from a number of different sites. This section can also be used to convert categories to tags or tags to categories. 

Force Regenerate Thumbnails: Used to delete all old images size and regenerate the thumbnails for your image attachments.