As you are aware of, every Operating System has a Hardware Compatibility List (HCL). The Hardware Compatibility List (HCL) identifies hardware that is compatible with the Operating System and provides information about available software support.
Hardware Compatibility List (HCL) for Solaris 10 OS:
http://www.sun.com/bigadmin/hcl/data/sol/
There are totally 906 system which includes OEM & System Vendor Products, VMWare,Servers, Desktops, Laptops andMotherboards and 1568 system components
Hardware Compatibility List (HCL) for Solaris Express Developer Edition:
http://www.sun.com/bigadmin/hcl/data/sx/
This includes 975 Systems and 1602 system components