Google Scholar Citations is a freely-available service that tracks article citations over time. It tracks academic articles and also counts theses, book titles and other documents towards author citation metrics.
Create Your Profile
Features
Building a Google Scholar Profile offers many benefits, including:
See who is citing your work
Graph citations over time
Ability to compute a variety of citation metrics
Your name will appear as a clickable link in Google Scholar search results
The publications list may be set to automatically update
Considerations
Google Scholar Profiles:
Will not consider name variations, including maiden names
May co-mingle works by different authors with the same name in its citation counts
Can have trouble with names that include apostrophes or other marks (like O'Neal)
Counts retractions the same way it counts other citations