I made this questions in ubuntu-es.org, hispanic ubuntu community, but this community is bigger and I hope you could help every new and future user of linux.
The first question everyone asks when gets interested on using linux is "what advantages does it have?"
So, it's important to make all potential users know what they win using Linux.
Post all the things you can do better in linux, in all the aspects of the system, hardware, software, everything. We don't need answers like "just 'cause it's linux" or "'cause it's not windows". No, real answers, real advantages, the real pros of linux. And also the disadvantages of using it (don't say it doesn't have, you know it's not true ).

This is headed for one of our "megathreads"--eg "Linux vs. Windows".

Your question is like saying: What car is best?

Best for who???--I could tell you all of my reasons and they might not apply to you.

I will confess to being on a mission not to feed the MS monopoly. There are many avid Linux users who do not have this motivation at all.

best for who? for each one, what makes it better for you? why do you prefer it. and it doesn't have to be against windows, it's not the only alternative. a lot of people uses mac, for example, maybe solaris, bsd (i know it's unix, but my thread is about linux).
for example, and sorry if i didn't say it before: i've heard a lot of things like "it's better for programming", "it's better for servers", but why? that's what you must say.

Simpler and more robust---and easier to set up (once you know how...)
Complete freedom
Powerful CLI

The Linux is NOT Windows essay will give you a load of information. It comes at the question from a different direction, but it should serve.

Linux has a cool Penguin Logo. End of story.

I do a bit of web development, and I really like the LAMP stack. The WIMP stack? No way