I have been in the business for 15 years now.I started as the guy that did the table-and-frameset static websites, and if I look back now there's a myriad of things that I had to learn and 75% of that I have probably forgotten again. The myriad of protocols, languages, frameworks, toolkits that you have to keep up to date with. Fashions in what the devs think is cool and what the customers ask for.

The most amazing thing to me however is what the browser and web technology now allow you to do. The way I see it, browsers are not document viewers anymore, they are akin to operating systems, and the web dev skills you have let you make awesome stuff you'd never dream of 10 years ago.

I have been tinkering with packaged chrome apps and UPNP, and in my mind it's nuts that I can do this, me, the humble web developer.

So to echo one of the sibling posts here: Just go and build something. Doesn't matter what. In the end what matters is whether people use your software or not. If you blogged and it made a difference, don't let anybody rubbish that for you. You're already a cut above the rest.