SNMP OIDs for Cisco 3560
These are some basic OIDS taken from a combination of public and private MIBs:
Public - RFC 2737 & RFC 1213
Private - (The OID for Memory is from a private MIB)

Object Identifier (OID) 

Property 

.1.3.6.1.4.1.9.3.6.6.0

Memory

.1.3.6.1.2.1.47.1.1.1.1.13.1001

System Model

.1.3.6.1.2.1.47.1.1.1.1.11.1001

BIOS Serial Number

.1.3.6.1.2.1.47.1.1.1.1.9.1001

Firmware Revision

.1.3.6.1.2.1.1.6.0

Location