That DMV never existed, I just tried it on 2005 also
there is sys.dm_exec_requests
and that returns the data in the slide attached as a comment
maybe it was a typo
sys.dm_os_* are the following dmvs
sys.dm_os_buffer_descriptors
sys.dm_os_child_instances
sys.dm_os_cluster_nodes
sys.dm_os_dispatcher_pools
sys.dm_os_hosts
sys.dm_os_latch_stats
sys.dm_os_loaded_modules
sys.dm_os_memory_brokers
sys.dm_os_memory_cache_clock_hands
sys.dm_os_memory_cache_counters
sys.dm_os_memory_cache_entries
sys.dm_os_memory_cache_hash_tables
sys.dm_os_memory_clerks
sys.dm_os_memory_nodes
sys.dm_os_memory_objects
sys.dm_os_memory_pools
sys.dm_os_nodes
sys.dm_os_performance_counters
sys.dm_os_process_memory
sys.dm_os_schedulers
sys.dm_os_stacks
sys.dm_os_sys_info
sys.dm_os_sys_memory
sys.dm_os_tasks
sys.dm_os_threads
sys.dm_os_virtual_address_dump
sys.dm_os_waiting_tasks
sys.dm_os_wait_stats
sys.dm_os_workers