pbsnodes -a -lists all nodes and their status
qstat -a -lists all jobs currently in queue and their status

checknode nodename – gives details about a particular node
checkjob job_number – gives details about a particular job
showstart job_number – gives a rough approximation as to when a job may start
showq – will give info about all the jobs, the important stuff is at the end where it will show blocked jobs. These can be unblocked with:

releasehold job_number – unblock or release a hold