AVR-Chat

Ok, before I start banging on this again..

I have the Devantech sonar connected, verified per docs that SDA and
SCL are connected to the right pins on the M128, and they are pulled
high, and that the scope sees valid high and low levels. 

I have the code that IMHO should start a ping, but I'm not getting an
ACK to the slave address.   I start the bus, I send E1 (E0 ID + 1 bit
for write) with ACK requested, and what I see on the bus is E1
followed by a high bit, which means NAK.   It's as if the sonar
dosen't hear me.
I also tried it on the  broadcast address 00, which gives me the same
result.

Tired different speeds, noticing that the devantech docs don't say
what speed to use.

Any ideas?