Hi All,
I have implemented Site Wide Search in nopCommerce 1.30. I know the version is too old but at least you will get a rough idea on the implementation in later versions. My solution is not optimal but it works. Have a look on the real site:
www.sandalaproductions.com
And the link where I have given the steps to implement this is: http://sadeqbillah.wordpress.com/2011/02/06/site-wide-search-in-nopcommerce/
And for implementing you may need the Events section I have provided in another post: http://sadeqbillah.wordpress.com/2011/02/06/implementing-events-in-nopcommerce/
Waiting for your responses either welcoming or not. :-)
Thanks, Meer