You can also:
1) View the queries in realtime (as root):
$ watch -n1 mysqladmin proc stat
2) Use the STATUS tab options from phpMyAdmin (as root)
3) Log the slow queries (config options from /etc/my.cnf):
slow_query_log=1
slow_query_log_file=/var/log/mysqld.slow.log
long_query_time=10