A new build of the Application Express Listener was just loaded. This new version adds lots of new features. Check out the Configuration in the install guide. Here's a screenshot of some of the new options available.
Another new thing is in the log file. Every 1000th request I print some statistics to the log file. The statistics include uptime, processing time , min/max/avg/median times for the requests. Here's an example of those statistics where the listener has been up for 9 hours for a total of 16 minutes of processing time to deliver 79.1M of data.
Current Time: Wed Dec 02 10:06:02 PST 2009
Server uptime: 0 Days 09:01:32.126
Total accesses: 1.95K
Total Traffic: 79.1M
Total Processing Time: 0 Days 00:16:52.965
Min/Average/Median/Max Processing Time: 6 506 308 12057ms
Min/Average/Median/Max DB Time: 0 288 205 9077ms
Active Requests: 0
1/3 active/available in cache apex