This article reads like a commercial without any scientific background w.r.t. the algorithms used. They even state it does not perform as well as other available programs.
Still, interested giving the game a try? It is really simple.
Start here to learn the rules:
Like the problem solving, this is a good site for problems:
Note, 30kyu problems are the easiest, then 25kyu etc. Hardest are the dan problems. (Believe me, they are really difficult)
Want to play against the computer? GnuGo is your friend>
Playing against real oponents on the web, there are 2 options: Turn-based (the slow progress variant) or real-time.
I can recommend for the turn-based variant Dragon Go Server and Online Go Server:
Personally, I'm not into real-time, but KGS is an alternative:
Note, people might not always be in the mood for chatting here.
Getting hooked, try to find a local club or check for players in your neighbourhood: