I work for Andreessen Horowitz ('a16z'), a venture capital firm in Silicon Valley that invests in software companies. Mostly, I try to work out what's going on and what will happen next in mobile and consumer technology.
As well as my blog, I send out an email newsletter on Sunday evenings that's essentially my notebook for the week, looking at what happened that was interesting and what it might mean. It now has about 33,000 subscribers and the archive is here. I also do a podcast with a16z and talk a lot about this stuff on twitter. You can also subscribe to my blog by email or RSS on the archive page.