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PuTTY's SSH-2 host key selection policy currently involves a fixed preference order of RSA then DSA. I occasionally think it would be good to add a preference list to tweak the policy, either to put DSA first (if you're really mad) or to move DSA to below the "warn below this line" line.
When there's a choice of host keys available for a host, perhaps PuTTY should adjust its stated preferences so that the ones it already has cached come first. Need to think about that a bit. At the very least, when a new host key prompt is given, PuTTY should mention if it already has host keys for a host in other formats - particularly important when the default protocol changes to SSH-2, or a server that previously offered DSS keys starts supporting RSA too.
Audit trail for this wish.