I don't know how "cool" these are but I use them daily so will post here as I remember
HTOP
- an interactive process viewer for Linux
At the moment I like to have this running on the local zaurus screen while I remote in, that way I get feedback as to what is going on easily.
LINKS
- text based web browser
I actually use this on a daily basis on my regular workstation to remote into various web based config systems. Links2 has some additional functionality.
AXEL
- download accelerator
Not sure if the Z will keep up but I tend to use this instead wget for downloads, just make sure to use the -a switch if you don't want your console flooded.
SCREEN
- a wrapper that allows separation between the text program and the shell from which it was launched.
Great for starting long running tasks from one remote session, and then resuming it from another later.
UNZIP & UNRAR
- uncompress files