>F-SecureSSH from www.datafellows.com is decent, and available for both Mac
>and PC. I think it's $99.
>
>SecureCRT from www.vandyke.com is the best telnet program in the world. When
(snip)
>use FSecure on my Mac, and SecureCRT from work on PCs & my girlfriend's
>laptop.
>
>both support X-11 forwarding and tunelling.

I also recommend Better Telnet for the Mac.  It's free, it's fast, and
it supports ssh as well as a whole slew of other options.  I dunno
about X-11 forwarding/tunneling as I haven't tried it yet, though.

-Dan