PProcM -- http://www.fusedcreations.com/PProcM/

PProcM is a system monitor written in perl under GPLv2 and higher.
PProcM requires the following Perl Modules
 Time::HiRes
 POE::Curses
 Sys::Statistics::Linux

all of which can be gotten off of CPAN.

PProcM creates a file ~/.pprocm to manage its config (which devices to show).  The format of the config is explained within the file

Hotkeys:
  r - reloads config file
  o - switches back and fourth between config panel and main page
  c - when relavent, clears error messages
  q or control c - quits the program