These features are new in beta 0.61 (released 2011-07-12):
・Kerberos/GSSAPI authentication in SSH-2. ・Local X11 authorisation support on Windows. (Unix already had it, of course.) ・Support for non-fixed-width fonts on Windows. ・GTK 2 support on Unix. ・Specifying the logical host name independently of the physical network address to connect to. ・Crypto and flow control optimisations. ・Support for the zlib@openssh.com SSH-2 compression method. ・Support for new Windows 7 UI features: Aero resizing and jump lists. ・Support for OpenSSH AES-encrypted private key files in PuTTYgen. ・Bug fix: handles OpenSSH private keys with primes in either order. ・Bug fix: corruption of port forwarding is fixed (we think). ・Bug fix: various crashes and hangs when exiting on failure, ・Bug fix: hang in the serial back end on Windows. ・Bug fix: Windows clipboard is now read asynchronously, in case of deadlock due to the clipboard owner being at the far end of the same PuTTY's network connection (either via X forwarding or via tunnelled rdesktop).