I'm probably in the minority here but I've never had much trouble focusing for an extended period of time if I care at all about what I'm focusing on.
I find that being on the internet (browsing facebook/twitter/reddit aimlessly) really numbs my brain unlike anything else in my life though. In fact I'd argue that my quality of life (and my productiveness and attention span) is exponentially improved the less time I spend on the internet.
Limit yourself on internet time imo and force yourself to read books, spend more time outdoors and/or with friends. I've read 7 or 8 books in the last couple months and I've never been a reader. Cannot recommend it enough. Oh and read nonfiction ldo.
IMO everyone should read this book whether or not you have a focusing/mind wandering problem:
http://www.amazon.com/The-Power-Now-...s=power+of+now
Like someone else said, I think it's more of a generational problem than an online poker problem. If you still can't focus then either get on some meds or
harden the **** up