I am trying to lose about 10lbs and get some bulk with definiton (and as most, 6 pack abs). I have been doing Atkins for about 10 days, and have stayed between 20 and 30gm of carbs a day most of the time.

Which type of diet is better, Cyclic Ketogenic or Atkins.

Thanks in advance for the advice

Depends on the situation. To properly do a CKD you need to be fairly educated in nutrition and be "in-tune" with how your body responds, best for athletes wanting to lose fat and maintain muscle mass. Atkins is fairly simple and more geared toward the layman, but doesn't make many concessions for the fitness types. It can be easy to dork up a CKD so if that's the route you choose, do some research and PLAN IT OUT. Literally day to day. Theres some pretty good, detailed info out there. Google is your friend. I have also had a few successful CKD rounds (I think EJ has also) so any other questions you have you can post here too. Good luck.

Seems like I read somewhere that a CKD is not a long term diet, you only do it for a set amount of time. How long should you do a CK diet, and should you change your work-out rountine after you get off the diet?

Yeah, it's not a long term diet. 6-12 weeks tops, I'd say, but you want to ease back into carbs when you're "finished" as you would ease out of the induction phase of Atkins.
I don't change my workouts when I cut. I still lift heavy to keep muscle I have. Strength will almost always decrease a little while dieting anyway, so I like to keep going to the best of my ability. Some poeple like to do lighter weight and higher rep for a more circuit/cardio effect, but I think that's just inviting muscle loss (especially if you do some kind of cardio already). After you're done dieting, I guess it would depend on your goals at that point. If it's just maintenance, I don't see any need to change. If you want to add muscle, you'll probably want to move onto a split of some kind as you should be plenty conditioned 6-12 weeks out. Just eat very clean and you should be able to add muscle with minimal fat gain.

Yup, CKD-ing right now and dying for this weekends carb-up :D Been a pretty heavy traiing week as I've had to teach a few extra classes on top of what I nomally do, so feeling a little depleated. Agree with everything Naxis said. Do a search for CKD in google or something and you should get plenty of info. The C-K-D site has some good info on it too.

I have read the carb up should last 24 to 48 hours. Is it best to start friday am after my work-out and go thru saturday night. Or go thru sometime sunday?

TKD sounds like a smarter approach than CKD. In either scenario, you're not going to bulk up while low carbing.

I have read the carb up should last 24 to 48 hours. Is it best to start friday am after my work-out and go thru saturday night. Or go thru sometime sunday?

Start your carb up immediately after your friday depleation workout and aim to eat around 10-12g per lean kg body weight over the next 30 hours or so. So yes, if you did your depleation workout Friday AM, finish your carb up on Saturday night. First 1/2 of carbup should be high-moderate GI carbs (higher toward the start of the carb up) since insulin sensitivity is highest in this period allowing a greater degree of glycogen uptake in to the muscles, second 1/2 should be low GI carbs. If you're thinking of doing a CKD, read up on it first as you need to be quite precise with it. Lyle McDonald's "Ultimate Diet 2.0" and Dan Duchaine's "BodyOpus" are good references (UD2 is more upto date).

Personally, I don't like TKD's as they don't allow full muscle glycogen replenishment and there's too much bouncing in and out of ketosis involved.

I have had the least amount of muscle/strength loss with most fat loss on a TKD. r-ALA helps regulate insulin and makes it easier to get back to ketosis. But it's definitely not for everyone.