Usability 
The mobile version of MarketWatch has detailed quotes and very good 1 day, 1 week, 3 month, 6 month, 1 year and 5 year charts. Usability is so-so on a phone. If you have a portfolio set up on the MarketWatch web site you can view it on the mobile site, however there is no persistent login you have to enter your email address and password every time which is annoying. There is a selection of about 15 in depth news stories for the desktop MarketWatch.