I'm also half of a startup team working on http://monotask.com, which seems somewhat similar to Concentrate (we'll almost certainly ask HN for feedback / critiques when we launch).
I've only just downloaded the Concentrate beta, but it looks like a solid app. Also, I really like the name / icon.
Both are valid concerns / issues. We've hopefully addressed them both within Monotask, but we'll see how it survives the beta and how it'll need to evolve. Would love your input when we launch.
Maybe it's just me, but every time I try a new software solution for time management, I find myself on Wikipedia within 10 minutes. The most effective technique I have discovered recently for concentrating is turning the damn thing off. Sounds crazy I know, but you'd be surprised how productive it can be to take an hour or two with a pen and paper attacking your problem with no electronics present.
I am the same way. I'm far more productive when I draw/write any design/development abstract on paper. Once you have a finished blueprint it is far easier to stay focused on executing your plan.
I think he/she modeled it after the Minute Maid can (see below). It's a good point though: people outside Minute Maid's end markets may not identify with the logo.
There are a few other Mac apps out there (http://macfreedom.com/, http://visitsteve.com/work/selfcontrol/), and a few Firefox extensions (http://www.proginosko.com/leechblock.html) that seem similar, although more web-connection focused, rather than web-and-application-focused.
I'm also half of a startup team working on http://monotask.com, which seems somewhat similar to Concentrate (we'll almost certainly ask HN for feedback / critiques when we launch).
I've only just downloaded the Concentrate beta, but it looks like a solid app. Also, I really like the name / icon.