Ooo, more info.  When I dialed in to send my previous message, route started 
working again.  Here's what it shows, reflecting how much pfutzing around 
I've done to try to get the network working:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
216.160.33.1    *               255.255.255.255 UH    0      0        0 ppp0
192.168.0.1     *               255.255.255.255 UH    0      0        0 eth0
default         192.168.0.1     255.255.255.0   UG    0      0        0 eth0
default         *               255.255.255.0   U     0      0        0 eth0
192.168.0.0     *               255.255.255.0   U     0      0        0 eth0
127.0.0.0       *               255.0.0.0       U     0      0        0 lo
default         216.160.33.1    0.0.0.0         UG    0      0        0 ppp0

I'm ignorant enough about this that, although I know there shouldn't be so 
many entries, I don't know which ones don't belong.  Help?  Thanks!  --Ben