Thanks to a tip over the weekend from my buddy and eco-blogger Paul Kedrosky, I’ve discovered AOL’s DailyFinance app, which has live stock quotes, interactive charts and real-time news and offers the ability to create and track portfolios. Along with the Bloomberg app, it has quickly become one of the apps I use most on my iPod (s aapl) Touch. Apparently I’m not the only one who likes it, either — it’s ranked No. 1 in the Finance category on the App Store. This app proves one thing: AOL is good at creating aggregated content experiences and as such should make that its focus, instead of mucking around in other businesses.