After a limited release, Google Scholar Citations is now open to all. From Google Scholar Blog:
“You can quickly identify which articles are yours, by selecting one or more groups of articles that are computed statistically. Then, we collect citations to your articles, graph them over time, and compute your citation metrics – the widely used h-index; the i-10 index, which is simply the number of articles with at least ten citations; and, of course, the total number of citations to your articles. Each metric is computed over all citations and also over citations in articles published in the last five years.”
Click here for more information and to create an account.