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.
In addition to the blog here, I send out an email newsletter on Sunday evenings which is essentially my notebook for the week. It has about 32,000 subscribers and the archive is here. I also do a podcast with a16z and talk a lot about this stuff on twitter.