I have implemented Mint onto the site so that I can quickly track users in real time. This does not exclude the other methods of stats that I use, log files - on-line with Webstats and Analogue and off-line with other tools, Pphlogger which I use on-line and Ezboo which I am about to demise from a load of sites.
Mint is really good and worth the money, $30, if you have just the one site. I need to track about 20 though so Mint is not going to make the cut unless Shaun brings out a pro version that can track multiple sites.