UCLA Libraries in their section on search and find provides an interesting and very useful comparision of Google scholar and other reserach databases. According to Google Scholar, Search Engines, Databases, and the Research
this web site, "You may find that Google Scholarâ„¢ gives you a quick overview of a topic and can quickly point you toward relevant material but that your results may not be as current or as comprehensive as you need."
As reported in the Distant Librarian Blog
, "One of the highlights is the Camtasia Studio screencast comparing results and search options in Schoogle and PsycINFO. Nicely done, and something I should do too..."
Jay's presentation Google Scholar and other Information Resource Tools: Constructive Analysis also compares Google Scholar with some other electronic subscription based databases including Ei Compendex, ScienceDirect and Web of Science. This presentation also attempts to point out when Google Scholar is best to use and when other resources can be more appropriate to locate the information you need.
(NOTE: This Powerpoint was developed in April 2005 for a presentation at the Drexel COAS E-Learning-Google Scholar Seminar and some of the links included may require updating)
Jay's commentary on Google Scholar was posted by Randy Reichardt in his blog scitech library question under the title Google Scholar -Commentary by Jay Bhatt