You've all heard of Google Scholar, but did you know you can now use it to create alerts for your searches?
Step 1: Search as usual for a keyword/author
Step 2: Click on the envelope symbol (in the bar at the top of your search results)
Step 3: Enter your email address (this will happen automatically if you're logged in to another Google service)
Then all you have to do is sit back and wait for new items matching your search criteria to be delivered to your email.