No, I'm currently running 1.2 Beta 10. I'll upgrade it when I get around to it, although I haven't had any issues.
m0n0wall has always supported SNMP. My wireless access point support it too.
My switch does traps, which I think is something similar. But traps sends information to an ip address. Not sure, need to look up that one. I'd like MRTG on the switch
Did that co-incide with a m0n0wall upgrade? (1.2?)