Bibliometrics and Impact Factor: Citation Measures and Tools
Citation Searching with Google Scholar
Keep in mind that Google Scholar includes citations from an array of sources in its cited by calculation, including PowerPoints and Word documents, and gives everything an equal rank.
Google has recently launched Google Scholar Citations, a tool that will allow an author to show their citation metrics over time, including an h-index score and total citation count as determined by Google Scholar's database. "After you identify your articles, we collect citations to them, graph these citations over time, and compute your citation metrics..." A public profile page can also be created.
Databases Useful for Citation Impact and Searching
Databases that measure citation impact with specific tools: