At the moment when you do a search you get results formatted by Google, Google does have the Google Custom Search Engine product which allows you to restrict results to certain sites and the ability to (partly) customise how the results look but if you don’t want ads displayed you have to pay anything from $100 per year (depending on search volume).
A post here suggests that Google might be about to offer RSS feeds of search results. This will be great news – we should now be able to (license permitting) format the results to look just like our own sites so the fact the results are coming from Google is almost transparent – I imagine there’s going to be some restrictions and ‘powered by google’ logos required etc but on the whole this could be big – particularly if you want to get results into something other than a webpage! eg for those vanity Google searches of your own name straight into your RSS reader! 
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