Google alerts is a Google service to which you can subscribe to new searchresults for a given query.

The default settings provide you with e-mail notifcaties, as in the screenshot below.

However, you can also choose to make the results available as a (RSS) Feed.

Once you have the URL for this feed, you can consume it in various places like; portlets and widgets in Portal, WCM and Connections. E.g. in a community, see the screenshot below.

This is a very easy way to be kept informed on new Google Search Results on your topic of interest.