If you don't want to start with big projects, and you're fine with JavaScript: 1. Go on to http://userscripts.org/ http://userscripts.org/ and find some non-tr

If you don't want to start with big projects, and you're fine with JavaScript: 1. Go on to http://userscripts.org/ http://userscripts.org/ and find some non-trivial script 2. Does it work with Firefox, Chrome, Opera? Sometimes a little fix can make it more portable. 3. Do you think it lacks any features, configuration options etc.? Go on and implement it. Most of the US are opensource-licensed and small enough to get started quickly.