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Diffie-Hellman group exchange was implemented in PuTTY some years ago (it's been present since 0.52).
However, the final version of draft-ietf-secsh-dh-group-exchange added a new key exchange method relative to earlier drafts, using SHA-256 instead of SHA-1. We should implement that too.
(Update: Note that this support was liable to crash in snapshots before r6606, 2006-03-13.)
Audit trail for this wish.