Phil,
I think this is an awesome project! I have written some custom software myself that monitors Dell servers specifically, and I have two suggestions for you that are not that hard to implement.
1) A plugin system using the iPlugin interface
2) There are open source libraries to send sms via google voice, would be really neat to have notifications via SMS when certain thresholds or events happen. (Then write this plugin using your new plugin interface, and you already have a tutorial on which people can extend your program by writing their own plugins)
Keep up the good work, and bravo for making your project Open Source!