http://www.macnn.com/articles/08/09/01/translateit.97.update/
TranslateIt! update adds hover support, dictionaries
updated 05:50 pm EDT, Mon September 1, 2008
TranslateIt! 9.7 update
RealSofts.com has updated TranslateIt! for Mac to v9.7, adding hover support, full text translation and new dictionaries. Hover support will allow users to translate a word by moving the pointer over an unfamiliar word (in any Cocoa application), with the translation in a pop-up window. Version 9.7 also adds morphology support, a multilingual user interface and custom dictionary building capabilities.
The multilingual dictionary requires Mac OS X 10.4.3 or higher and costs $21 for a one-year license and $50 for a lifetime license.
