Who's On My Wifi
Who Is On My Wifi detects intruders
on your wireless network.
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Wireless Monitoring Software
There is good software that basically makes the job of checking logs in a Wireless Router, or for larger organizations, checking logs across multiple routers easier. One such product is Hardping also by IO3O, but there is plenty of other good software out there too that does the same thing.
These types of software basically give you exactly what the log files give you. A real-time look at exactly what MAC Addresses are currently on the network from a single interface at a single point in time.
Most of these kinds of products rely on sending out ARP packets (hardware level request packets) to each computer on the network and seeing which computers at which ip addresses reply.
These programs are basically a replacement for checking log files because they give a real-time look at who is currently on the network.