Monitor remote Ubuntu server's bandwidth usage using Nagios?

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http://serverfault.com – I recently setup Nagios for the first time and I love it so far. Figuring out how to better organize all those config files took a while, but once I had a better understanding of everything I'm really enjoying this. I have a current server setup to monitor all our EC2 server instances such as processor load, disk space, memory usage, and so on. I'm using the standard SNMP as well as NRPE to get things like the processor loads from remote machines. That being said, I'd really like to monitor the bandwidth usage of each machine. I've found a number of plugins and guides, but they all seem to (HowTos)