While NetScaler team have been crazy busy with Synergy events and integration projects, another blog was published about using all the cool feature sets such as server load balancing, callout, responder policy, caching, and in addition, the blog also discusses pattern sets and including real GeoIP into the setup.  So, definitely get your coffee ready and some crackers/chocolates with it because this blog does an awesome job explaining in detail the steps to using some of the key features and really show case why NetScaler is the right fit for these requirements no matter what geographic location you are.

Thanks for the blog Neil Spellings:  http://neil.spellings.net/2013/03/28/using-netscaler-http-callouts-for-real-time-geoip-and-anonymous-proxy-detection/