Show network/wireless/system statistics - routing table, ARP table, wireless statistics etc.
Access Point statistics for cards in AP mode - list of stations associated with their signal levels, TX/RX statististics and so on.
Show system log - show's contents of the system logfile.
Signal statistics for a selected IP/MAC address - if you use Ad-Hoc, use this option to see signal levels of stations you're communicating with.
Advanced Traceroute (mtr) - mtr is a very useful tool which combines ping and traceroute functionality.
Network Benchmark Tool (ttcp) - use this to test throughput between two routers.
Bandwidth Utilization Monitor (bmon) - this console tool draws a graph which shows current utilization of selected interface.
Wireless statistics monitor (wavemon) - this tool shows status of wireless connection in real-time. Useful for alignment.