Just had my first look at The Dude - looks like a very promising little program!
Anyway, a couple of bugs for you:
Bug 1: When trying to delete the following device:
Name: marmoset.ask4.local
Address: 192.168.16.10
DNS name: marmoset.ask4.local
I get the following fatal error from dudes.exe:
The instruction at "0x0040f534" referenced memory at "0x000000a8". The memory could not be "read".
I notice that the "Map" column for this device says "Local", but the device does not appear when viewing the Local network map - maybe this could be a problem?
Bug/misfeature 2: When trying to "discover" SNMP-based services, Dude does not distinguish between SNMP queries that fail or those that succeed but fail their monitoring thresholds - meaning that only services that are "healthy" to begin with get added to the service list.
Keep up the good work guys!