MDMUNOZ  Wow. Let me say this: contrary to what you imply, there are other (read: not emacs) open-source editors for the mac that integrate completely into the os, follow human interface guidelines, and aren't bloated with 30 megs of crap.

Emacs can do lots of neat things, but it's clunky and unusable for a lot of people. Alluding to some sort of windows-switcher ignorance or love of eye-candy won't save you from the reality that emacs is bloated and anachronistic. Most people want to actually edit text in a way that is intuitive, simple, and plays nice with their operating system. if you want to spend all day writing lisp hacks so you can attempt to finally create that Photoshop emacs extension that has so long kept it from being its own operating system, more power to you. But that's no reason to whine about the "ignorace" of the Mac community.  
(Version 0.9.9d)

MRGANDO  I use TextMate for my editing, please point me to other "Free Open Source full Aqua appearance" OS X editors ( for programming of course , or laTex ). This is a great piece of software, I say so even if I haven't used emacs at all ever ( I always used VI ).  
(Version 1.4)

JJL  Aquamacs is now a lovely size 134.4 MB in its .app directory, somewhat voluptuous compared to twiggy TextMate's 29.9 MB. However, they both zip along gracefully on two cores clocking 2.3 GHz. A twenty-year marriage to emacs can't be without some nostalgia and a quiet reverence for the many occasions emacs has saved my life, my ambitions, or, at minimum, my sanity, on no fewer than a dozen distinct operating environments. Aquamacs 1.5, in D. Reitter's caring and thoughtful hands, shines in its elegant, talented demonstrations of refined, tested, experienced design.

In OS 10.5.5, I do prefer TextMate to any other among its peers. It is a young code-base, but plainly brilliant and prodigious. It has the great advantage of having lived it's most formative years contemporaneous with OS X, and this shows in its resilience and creativity with the networked, many-tiered problems that have come to fore in modern times.

Frankly, I adore them both.   
(Version 1.5)