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what's the best way for me to get more yardage without giving up too much control?

Which clubs do you want to gain distance with? I think the easiest way is to use different shafts. Use lighter ones or you could even put graphite shafts in your irons. Then there's hitting the weight room. Bulk up and you'll be able to hit it longer.

Take lessons from a Pro, a good one, and practice, practice, practice.Modify your equipment when you have a sound repetable swing, and have stepped up to some quality equipment, (this is assuming you havn't already done so).

I recently started to try a bigger hip and shoulder turn on my drives. I have gained 10-15 yards and a fairly consistent trajectory and pretty straight.

I give tons of lessons to people who only want distance. Once you have the proper club/shaft/stance/basics, there is only 1 thing that will definitely add yards to your shots--- WIDEN YOUR ARC! If you can make a full turn (back to the target) and maintain a straight left arm- the club could be no further from your body and the shaft could not be travelling much faster. If nothing else, by keeping your left arm absolutely straight, you will definitely hit it longer and you iron shots will be more accurate because you'll have to make a shorter backswing.

I can hit the ball along way. this is because i use all the power in my swing so i send the ball flying.

Not a pro but I have noticed that it's all about Tempo. If you you keep a smooth temp from start to finish and when I say finish I'm talking about the same thing as Hethenchem you will hit the ball sweet and long.

Are you not sure how you do it? I think that is the question.
But if I were you, I would stay away from this particular forum if you are not sure. Many golfers can remember when they hit it sweet, usually before they subscribed to Golf Digest or some other overly helpful publication.

widen your arc by straightening your left arm, then swing for the fences and stay behind the ball

Practice, practice, practice. take lessons. get fitted for your clubs. another couple of things that helped me is to wider your back swing and really accelerate your clubhead through the impact area. most ameteurs make the mistake of trying to gain distance by swinging hard at the top of the trasition in their swing. Start the down swing slower and fell like you swing faster in the hitting area instead. also the cobra 440 is probably the longest driver i hit too ;)

I have been trying different things to increase my distance, including knee bend. The question I have is, do you have to turn your BODY or your SHOULDERS? Exactly how can you practice this? Also, how can you maintain a straight left arm? Any drills?

First the turn is a turn of the shoulders and upper body, think of standing in a barrel and turning at the waist. Another thing that has helped me gain distance was that I found that I was shifting my hips side to side, I got a piece of round rod about 1/4" in dia. and about 40-45 inches in length and stuck in the ground on my left side (right handed player) at about a 45 deg. angle, (old shaft will work also). Practice keeping your hips against the rod or shaft and not moving away or pushing the rod toward the target. The other thing I did to help get a stiffer left arm was to go to a CVS or similar drug store and get a elbow support this will help in learning to keep the arm straight. All has to do with muscle memory this helped me to get that muscle memory built up. Give it a try at the range or in your back yard using a 8 or 9 iron and taking 1/2 swings, the elbow support what cost that much and if you got a old shaft then you got the other part needed.

I won't offer any swing tips here as I'm sure there are a lot of other golfers here who are much more qualified than I to give this kind of advice. I do think getting fitted for your clubs can help a great deal, though. I've been in a "slump" recently. Last year, I was playing at an 8 handicap but I've been shooting around 90 recently. I compare myself to Tiger. :D

Anyway, everything seems to have gone down the drain. My distance went down. My slice with the driver came back. My short game went and my putting has been horrendous. Then a couple of weeks ago, I got my irons reshafted. I had stiff shafts in them but put lighter regular flex steel shafts in. From my first outing to the range, things have been turning up. I think my confidence with my newly fitted irons have transferred to my driver as I can now hit draws again. Now all I need to do is get my putting in line.

Anyway, I think getting fitted is an important part of the game if you're a mid handicapper or better. If you shoot 110 everytime, I doubt it'll help much but I wouldn't be able to tell you for sure.

I think hitting it long is a little overated. If you are playing a very long course regularly then I guess its important. But, most courses I play are not so long that with a good 250 drive and strong 3 wood shot you can't be close to or on the green in two or three with a two putt for par.

I focus on course managment, accuracy and putting.

I agree...I think tempo and timing are key elements to maximize your swing speed at moment of impact....