Can somone please tell me if its possible to setup a Cisco 1801 for etherchannels to a Cisco 3550 switch?
That does seem like a possibility. Other option is to use EIGRP that
supports even un-even cost load balancing.
It seems like 1801 does not support Etherchannel configuration. The
etherswitch module on 1801 is similar to HWIC-4ESW/HWIC-9ESW which do not
support etherchannel either.
Here is a document that describes Layer 3 Etherchannel support on ISR
Hope this helps.