You may have a marker but your location appears somewhere other than where you are looking. Have you searched the KML to see if your IP Address exists?
https://smsz.net/btcStats/bitcoin.kmlThose running mining software only and not running a bitcoin node will not appear on the map.
someone suggested to have a counter to indicate how many nodes are active. that would be very useful.
related to this, does anyone have an idea how many bitcoin users there are today ?
See:
http://bitcointalk.org/index.php?topic=3149.0