On my opinion, one of the best ssh/telnet clients for windows, putty released a new version:

Get it here, PuTTY 0.59

- PuTTY can now connect to local serial ports as well as making network connections.
- Improved speed of SSH, particularly SSH-2 key exchange and public-key authentication
- Improved SFTP throughput

PuTTY Change Log

regards pressy