Most notable benefits:
– since you enter the search terms as part of the URL, you can bookmark regular search items (if you regular search for a certain word, you can bookmark http://word.gada.be)
– as the search term is part of the URL, it is much more convenient when entering the URL through a mobile phone.
– it’s a meta search. So it returns results from Google, MSN, Yahoo, etc. all at once.
And of course (and not least), the blog post of the originator of all this.