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Don't forget in the process the plethora of hand techniques that TKD brings to the party. From what I've seen though, those are all very good techniques.

They're more prevalent in traditional ITF Schools than WTF or ATA Schools. Got a wicked bruise on my chest right now from my brother-in-law (he practices ITF) delivering a lovely spearhand during sparring. Paraphrasing him, "Lots of modern dojang won't even really teach the hand stuff unless you specifically ask for it." More's the pity, since TKD is almost as wicked in the clinch as Muay Thai but many of the practitioners prefer not to get that close.

yeah i train in a dojo that's run by the ATU

Somebody get Baka a cookie. smile American Taekwondo Association. A good organization, though most ITF and WTF schools consider them a bit esoteric and... odd. From what I've seen, they're good if a bit overpriced in most areas. They're a school that is franchised but has managed to avoid most of the "McDojo" phenomenon that damages and waters down so many other arts.

The trick with learning TKD from what I've seen is finding a good dojang that will teach the traditional forms as they were originally conceived alongside practical application, sparring practice, and breaking with less emphasis on point sparring (since most of the tactics used in point sparring are less than useless in a self-defensive situation.) That's not all though. The key to a good school seems to lie in those extremely rare TKD dojangs that actually teach TKD's grappling techiques thoroughly. You'll find plenty that teach the basics ("grab here to kick" kind of stuff) but there is also an extensive control grappling format and a few exotic types of submission grapples that could make an MMA fighter weep with joy (incredible variations on the armbar and leglocks in plethora.) However, and I paraphrase from my brother-in-law the TKD savant, here in America after you reach your black belt (which is extremely hard to do in a traditional dojang) prepare to teach yourself. It's fairly easy to find a place that will teach the basic fundamentals, most non-McDojos teach those well. However, as soon as you start to look for a master that will teach the more advanced techniques (i.e. practical switching applications, TKD grappling and joint locks, hardening, etc.) you'll find them to be as rare as hen's teeth. I thought it was hard to find a good Baguazhang teacher, but apparently it's even harder to locate a good, advanced, traditional teacher.

Also, a fringe note. If you want speed with great endurance, a WTF or ATA school is the way to go. The way they train to move and practice is geared for that sort of thing. The trick is that many of their techniques (in America, at least) have been watered down and weakened for competition point sparring, robbing them of power in favor of quickness. I had the privilege of sparring with a WTF black belt at one point. He was quick and agile, but his blows barely registered on my Krav Maga-hardened body.

If you're looking for power and fundamentals with a traditional background, find a good (but rare!) ITF school. Their TKD isn't as fast or flashy as WTF or ATA, but you'll rarely be exposed to the McDojo phenomenon or the 10-year-old Black Belt phenomenon. (For those who don't know, in traditional TKD it is pretty much unheard of for a person under the age of sixteen to be awarded even a red belt, much less a black belt.) Anyway, the movements aren't quite as quick, but the kicks and hand striking techniques are unbelievably powerful. My brother-in-law, for instance is no longer allowed to practice his kicks on the bags and dummies in the dojang he attends because he regularly breaks them. Funny story, he began to attend an MMA class to see what they were all about. In his first actual bout, he was told by the ref that he had to tone back his kicks because they were too hard for the other fighter.

At any rate, there's the rant on that.

how would any style adapt to the MMA? going in with just one art under your belt i would think might put you in a disadvantage with the MMA given most fighters have 2-3 arts under them.

course just in a single style situation had i been the TKD Fighter i would use quick blows and keep my distance from my opponent.
also do whatever i can to tire my opponent out.
of course thats pretty much basic to all fighting >.>

First Off In a fight between 2 people grappling in usually the deciding factor, anyone can hold there own standing as long as they have power, and cardio with a basic understanding on how to strike. the learning curve for striking is a quick one. while grappling has to many to master >.> so yes theres a disadvantage if a grappler stands up with a TKD Person but not as much of one if the grappler gets to to the ground. not to mention if were talking about TKD vs Random sluggers TKD is not so good since it has low perfection for the head keeping you hands at your waist is not good practice.
That least to the question how would they adapt TKD for MMA? well ive seen it done alot, its just give them a kickboxing coach they learn how to defend there head. they cut the crescent kick and other useless crap thats low % moves and they usally have a great base speed and alot of snapping kicks.