I've been doing the wheat/gluten-free thing.
I'm sure a lot of people think this is extreme, and as a result won't want to give it a shot... but it's really not that hard.
My mother was the one who talked me into trying it. She cut out wheat and gluten from her diet as a result of digestive issues... she did it by switching to rye or gluten-free breads, and eating rice pasta, and avoiding baked goods, and without a change to the amount of exercise she puts in... dropped about 60 lbs over about... maybe 8 months? And has kept it off successfully for over a year. Which is nuts. No one's ever yo-yo'd more than my mother dieting-wise. Obviously, she also portion controls her sugar intake, and doesn't tend to eat fried foods, but... she found that what really kick-started her metabolism was the lack of gluten-infested foods. She looks, and feels better, and it turns out that her digestive issues were in fact a gluten intolerance.
So, despite not having a wheat/gluten intolerance myself, she managed to convince me to give it a shot. Cutting out wheat and gluten hasn't actually been that big of a deal for me. I instantly started dropping in weight, and my food cravings haven't been half as intense as they used to be. Essentially, I've stopped eating baked goods from the coffee shop where I go everyday for lunch, I replaced bread with rye, or gluten-free bread, and I now eat rice pasta instead of regular. I'm allowed to eat rice, and potatoes (things you can't eat if you're on something restrictive like Atkins..) and I don't ever feel like I'm deprived.
I think the fact that I know that there's a lot of junk that I COULD eat without going "off-plan" makes it better. I can still have the occasional small thing (I had a small fry from McDonald's the other night

) and just knowing that I don't have to beat myself up over the little things has helped keep me on-track.
What I eat.. well, firstly, there's a lot of debate as to whether or not oats have gluten in them, and the consensus seems to be that they have a different kind of gluten protein in them, and the real concern is for cross-contamination for people who have severe gluten allergies... either way, they don't tend to bother peoples' digestive systems as much apparently, and I don't have severe allergic reactions, so on an average day I eat:
Breakfast:
Organic Oatmeal with blueberries, and about a teaspoon of organic honey to sweeten
Lunch:
Sandwich (gluten-free or rye bread) with calorie-reduced peanut butter and sugar-free jam
Rice crackers (cheddar flavoured, yumm) with a bit of light cream cheese
Grapes/other fruit
Fruit/Nut bar called "
Larabar." Love them. They literally.. are good for ANYONE. These things are sugar-free, gluten-free, dairy-free, soy free, vegan, and kosher... and they taste AMAZING.
Dinner:
Big pile of steamed veggies (whatever kind I'm in the mood for) mixed in with spaghetti (made with rice pasta, and organic primavera sauce)
Snack:
Rice crackers. Oh for the love of god, do I ever love rice crackers.
I'm trying to find the link for the website I was spreading around earlier... will edit when I find it.

But I suggest giving it a shot, if only for a week or two to see how you feel!
*EDIT*
Ah, okay, here we go. This is essentially the mentality behind me giving the no-wheat/gluten thing a shot:
http://weight.insulitelabs.com/Addiction.php