Can a Catalyst 3560 support Ethernet Channel in different switches? (something like Cross-Stack Ethernet Channel on Catalyst 3750)How can i configure that?
No. However you can implement load-balancing using multiple-VLANs & STP or using equal-cost paths if using layer-3. There is no way you can configure EtherChannel over multiple 3560's.
It may be worth posting some more details as to your network topology for more assistance.