While Google products in general may be overhyped, Scholar is very nice. I have used it for two projects, and also tried citeseer. I haven't tried the others, though I did have access to the ACM Digital Library and IEEE transcripts.
In actual searches, scholar.google.com trumped all three of them. I found more papers that were relevant to my topic, most likely because of the full text search. Often, I was looking for a paper that implemented a technique not listed in the abstract but still used in the paper.
Why didn't they include search engine results?
All competent search engine reviews I have read created a set of search queries and tested the engines based on that.
Slashdot Mirror
While Google products in general may be overhyped, Scholar is very nice. I have used it for two projects, and also tried citeseer. I haven't tried the others, though I did have access to the ACM Digital Library and IEEE transcripts. In actual searches, scholar.google.com trumped all three of them. I found more papers that were relevant to my topic, most likely because of the full text search. Often, I was looking for a paper that implemented a technique not listed in the abstract but still used in the paper. Why didn't they include search engine results? All competent search engine reviews I have read created a set of search queries and tested the engines based on that.