Two simple items.
1. My Dlink has a web page showing who's connected.
2. I also use the MAC filter and only allow "my" machines.
I have a D-Link 624+ which I am using WEP on but I'm still wondering is there software somewhere out there that will allow me to see who is accessing my wirelss network just so I feel safer knowing that no one other than those on my home network are using it.