I wonder what percentage of the broader audience has difficulties like the one mentioned in that thread. I'm within a few weeks of launching a Web 2.0 startup focused on the mortgage industry. One of our goals is to make shopping for mortgages very easy to understand. But I'm not sure how we do that for someone who is also having problems typing "www.google.com" in an address bar. Should my goal be to make my product usable for the (I hope) 5%-10% of the market that has these sorts of difficulties? Or should I write them off, and focus on making the best product for the people out there who are more capable? It's an interesting question to ponder.