managing ethernet and wireless interfaces

[sime]

I would like to know how linux laptop users are managing multiple 
interfaces (eth and wifi).

I use ethernet with DHCP regardless of location. Wireless one location 
WEP, other location WPA.

By choice none of my interfaces are initialised on boot. I prefer to 
bring them up using ifup(8).

Below is essentially my /etc/network/interfaces file:
auto lo
iface lo inet loopback
iface eth0 inet dhcp            # Wireless
        hostname tempest
        wireless-essid blah
        wireless-nick blah
        wireless-key blah
iface eth1 inet dhcp            # Ethernet
After managing to get WPA to work, I started hacking around in 
interfaces(5) but got no where. Now if I action `ifup eth0` with the 
eth1 line commented out I get:
DHCPREQUEST on eth1 to 255.255.255.255 port 67
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8

If the ethernet cable is plugged in, it will get the DHCPACK:
DHCPACK from 192.168.1.1
bound to 192.168.1.117 -- renewal in 43200 seconds.
Why is eth1 making DHCPREQUEST ? Further it would be great if someone 
chould show how the mapping works as I am getting no results. 
Additionally if you are using any other packages for managing multiple 
interfaces please let me know!

-sime
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