perhaps you should give a try to phpmyvisites ot piwik, see my post below, I know nothing about piwik, but I enjoy phpmyvisites (I use it for 3 sites, gives great results)
I have started to use Yahoo's mybloglog there are two versions the first is free gives you limated stats shows you ten keywords and ten sites your users came from delaided by 24hrs. The second is not free there is a charge of $30 the difference is that you have real time stats and it will show you all your stats keywords, where you traffic is coming from. One thing I love about is that you can see what your users click like google ads I have cought google out on alot of clicks. www.mybloglog.com is the site.
StatCounter provide comprehensive realtime analysis and load fast, but if beyond 250,000 pageloads a month, you will need to pay.
I use google anylitics, get clicky and smarter stats.. Nothing matches in terms of specific numbers, however the do kinda follow the same trends/ For example if i get allot of traffic they all report a higher number. I Find smarter stats which read the server logs to be most accurate.
I've written an ajax page and some javascript to watch my web visitors in real time. You can install it too if your server runs php & mysql. Check out the live demo via nimisis.com/software/live_web_stats.php
I prefer iWebtrack.... I have personally tested it. Its free and has many functions.... some of them are listed below:- > Observe Visitors & Trends Monitor the activities of every individual to your website, view graphical web stats and analytics, visitor system information, and traffic/buying trends. > Improve ROI Track and analyze the performance of all of your online initiatives, search engine results, and marketing campaigns with iWebTrack's enterprise-level web analytics. > Track Campaign Effectiveness Fine-tune your pay-per-click advertising campaigns and easily identify the difference between PPC searches and natural results - and their resulting conversions. > Website and Traffic Monitoring iWebTrack can also monitor your website and send you an e-mail or text message if your website ever goes down or when advertising trends change. > Export Reports iWebTrack reports can be automatically e-mailed to specific employees within your organization daily, or downloaded in a variety of formats. You can visit my signature link and download it.... Regards...
the only real time visitor analysis software is Visitpath as far as I know. It's like watching TV of your website visitors, as if you were sitting behind them. test is on visitpath . com for free