I'm a long-time user of free/open source software, and write various things for both fun and profit. I don't take myself all that seriously and I do all of my own stunts.
You can find me at these fine establishments on the web: Open Source Musings, The Monday Kickoff, Weekly Musings. and The Plain Text Project.
Authored Comments
There's also nvALT (a great note taking app), which I'll be looking at in an upcoming article
Not every website is viewable in Reader Mode. I have no idea whether they block it or confuse it.
It's not just reader mode. I've run into that problem with other read-it-later tools. Some sites are just coded to stymie those tools. Probably has something to do with being able to track readers, advertising, or some combination of those and other factors.