Bonding or etherchannel in Cisco speak requires both members of the group to start and end on a single piece of hardware. I've never hear of any kind of multichassis etherchannel, although things happen so fast in networking I may be behind on this.
Having said that some stacking switches allow cross chassis etherchannel, but bused switches are a bit of a cheat and not really multi-chassis.
You can dual home to different switches, and run behind a virtual address, but as you say this only gives you failover. A primitive type of load sharing would be to run two virtuals favouring different interfaces, give half your users one to connect to and the other half the second.
If you have a DNS server, this make Load Sharing by session between two virtuals easier as two host entries will be handed out in a round-robin fashion so would be a more consistent form of load share.
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