Spotted by way of Peter Suber’s Open Access News:
Search Pigeon is a collection of Google Co-opTM Custom Search Engines (CSEs) designed to make researching on the web a richer, more rewarding, and more efficient process.
Designed for researchers in the Arts and Humanities, with a decidedly interdisciplinary bent, the objective of Search Pigeon is to provide a tool enabling the productive and trustworthy garnering of scholarly articles through customized searching.
Right now SearchPigeon.org provides CSEs that search hundreds of peer-reviewed and open access online journals, provided they are either English-language journals, or provide a translation of their site into English.