GoogleAjaxSearch, the aptly named add-on module for Open Source Web CMS, Drupal, allows you to add inline Google search modules to your Drupal implementation. The main GoogleAjaxSearch module allows you to add inline searches over a number
of Google services including Web Search, Local Search, Video Search, Blog Search, and News Search.
This add-on includes a macro generator which allows you to interactively create a GoogleAjaxSearch inline tag which gives you ability to create multiple inline Google searchers.
looks very promising and the module is easy to install and implement. It does require a Google Search Ajax API key
and thus functionality is limited by any of the related Google restrictions, which, at the time of this writing, do not include a limit on the maximum number of searches executed per day.
The development team is called Meant4.pl and they are based out of Poland. The module can be downloaded here