Here is a video from Matt Cutt’s discussing Meta Tags.
In brief, keyword meta tags are not used by Google for Search Ranking — <meta name=”Keywords” content=”not used by google” />
However Google still use the description meta tag – <meta name=”description” content=”keep using meta descriptions ” />
see other Google videos
Here is an interesting service from Google, that allows you to search based on your location using your iPhone. This is very handy if you are looking for local search results, based on your exact location.
Check out the video