Try some searches, and also see if you can identify the collections they draw from (there's usually a link somewhere to the list of contributing collections). In your blog, discuss what you think makes a good (useful) federated collection and why and how the service providers you selected did (or did not) create a good (useful) service.
Citebase is seeded by namely the arXiv.org database, a couple of EPrints databases, and some medical databases including Pubmed. The good features of this federated search are that it includes in the results line the number of times the article has been cited. On the detailed item page it lists what other articles cited the current item, easy access to references, and a tab listing similar articles, “cites similar articles to.” Considering its experimental state, the site is in very good condition. The results text could use some formatting to make it easier to read than its current lengthy black and blue text over white background.
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