Xen users - Jul 2010 - xend start (not building br0 or vif interfaces)

I''ve just gotten xen-4.0.1-rc4-pre on top of Ubuntu 10.04 using the 
2.6.32.15 kernel source installed and booting into Dom0 thanks to you guys!

I was under the impression that xend would setup at least a basic bridge
interface and some vif interfaces automaticlly.. I don''t get any of
that. And when I try to start xend manually after reboot I get:
ifdown: interface eth0 not configured
RTNTELINK answers: Device or resource busy

Not sure what''s going on.
Thanks,
-S

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