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

PuTTY is for UNIX, as well! And the UNIX version also works with comm ports. Hurrah, and about time. Minicom was painful.

For all of you who works under NT environment, I want to share this software - it's a console client, much like "Konsole" in KDE, but for Win. It has tabs, possibility for splitting up to 4 windows in one tab, all the commands available (send signals), authentication methods, etc, plus color schemes, it can look just like Konsole.