I thought gnutella would support searching for hashes other than sha1, too.

G2 does. It supports searching for MD5, eD2k, sha1 and the tth root hash. Other hashes could be supported, if they were supported by software using the G2 network.

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</td><td><a href="http://crawler.trillinux.org"><img align="right" style="border:0" src="http://crawler.trillinux.org/img/netsize.png" alt="Network size"></a></td></table>