Not really however Cisco are looking to drop the conduit command to bring it more in line with Router IOS.
Read the above as- Do not use conduits.
They are deprecated in favor of ACLs.
They are present in the later 6.3(x) releases for backwards compatibility and legacy configurations only. IIRC, they aren't even available in 7.x releases and not worth learning except to convert old configs from conduits to ACLs.