curl doesn't support rfc2723.

[misiek_at_arm src]$ curl ftp://[::1]
curl: (6) Couldn't resolve host '[::1]'

It looks easy to fix but I was to lazy to do that :-)

(curl-7.8)

ps. also IMO curl should support ipv4 addresses inside brackets, too
(even if compiled without ipv6 support).

-- 
 Arkadiusz Mi¶kiewicz, AM2-6BONE, 1024/3DB19BBD
 IPv6 ready PLD Linux at http://www.pld.org.pl/
My jsme Borg. Odpor je marný, budete asimilováni