I don't know about bandwidthd but outbound loadbalancing has changed in 2.0.
To configure it you setup a gateway group (system >> routing >> groups) and add your WANs to it. Then assign each wan a tier, all tier 1 will result in equal priority and hence load balancing. Use lower tiers if you want failover.
Now edit your firewall rules to use the gateway groups as gateway.
Edit: Exactly which version are you running? If you are running the 'official' RC1 release, 26.02.2011, the try a much more recent snapshot. A lot has been fixed since then.