I'll never let my dog handle my slippers!!
Well, it's not working meaning that it's not doing what it was expected for it to do, that is, redirecting to a different page. You could say it fails to do anything.
I ended up using a piece of js (it was my second best bet) that seems to be working fine, since I was in a bit of a hurry (my client was starting to despair).
I found the js piece of code here: JS REDIRECT CODE
And here is the URL for the website, not officialy "on the air" yet since there's still a couple of things left to do.
I´d be interested anyway in a way of sorting the conditional comment thing, if you have the time. I like it a lot better as a solution for redirecting after detecting the IE version. As I said, I placed it right after the opening <head> tag.
Here is the comment again:
<!--[if IE lt 7]>
<meta http-equiv="refresh" content="0;url=http://www.ficoprieto.com/tartaruga/index.html">