Depending on which country you live in, taxes can be a real pain and will only leave you with a small bit of your salary. Not to mention transportation could eat up a lot your otherwise "free time" in the evenings. :(
I do agree that freelancing would definitely give some nice extra income but only if you're disciplined enough to find time for it.
Are you referring to the new UI behavior (new at least to me, since this is the first time I've seen this) when you click on directories/files in the repository file browser like in https://github.com/git/git for example?
I don't really use the github file browser frequently enough to be able to tell if the async loading of the files/directories is what you're referring to. Plus, linking to the github home page was kind of confusing.
You can have multiple blogs associated with the same email. I'm just not sure if it's possible to create a new one by sending an email as the first post.
"Zsh is able to emulate POSIX shells, but its default mode is not POSIX compatible, either."
from http://zsh.sourceforge.net/Doc/Release/index.html