Question for all of you Router geeks and Unix sysadmins

Hey guys, I just purchased a Keyspan USB to serial adapter for my Powerbook. I'm using it to console into routers and Sun servers, and so far, the only software I've found that works with it is called Zterm. Well, Zterm is a little bit buggy and doesn't always refresh the screen properly when using VT100 emulation. Sometimes, it leaves lines on the screen where they shouldn't be. Does anyone know of a better software package that is out there? Is there a version of tip or some other software available for Panther that would let me use a regular Terminal window to open the serial port?

Thanks in advance for your input.