SecureCRT is a great SSH and telnet terminal client. It’s not free, but for the price, it’s well worth it.
It handles ssh2 very nicely, and has a username system that’s better than PuTTY, in my opinion.

The only thing that I don’t like about it is that it makes a little beep by default when you hit certain keys; For example, if you type cd somedir and hit tab, it’ll autofill what it can (the functionality actually comes from the Linux shell), however, if it can’t complete a filename because there are two similar ones, it’ll play a little beep. As with another post of mine, little beeps for things are extremely annoying when I’m wearing headphones, so here’s how to remove the beep in SecureCRT version 3.3 (I realize this is an old version, but I’ve never needed to upgrade):

Go to Options -> Session Options. Click on “Options”, uncheck the “Audio Bell”.

This will remove that little beep in most situations.