I'm working through a mindfulness meditation book (The Mindfulness Prescription for Adult ADHD: http://www.amazon.com/gp/product/1590308476/ref=as_li_tl?ie=... ) which helps me regain some of the focus that I feel as though I've lost. I've been at it for about two days, and I feel as though I've been helped a huge amount-- I bet it'll be helpful for others, even if they don't have ADHD, as it offers a lot of tools to address the constant zig-zagging of attention resulting from our super-stimulated environment.

If meditation practices fail at helping improve your focus, there's always stimulants. I enjoy brewing up the beans from Stumptown.