Advice on not giving in to cravings?

I think you'll find that everybody handles it a little differently. Some people can have just a little bit and beat their craving that way. I for one am generally an all or nothing kind of person. I can't just have a little so it's better for me to have none. For my sugar cravings I've started to have 1 piece of 90% cocoa at night. It's bitter enough that I don't want to have more than one but sweet enough that it satisfies my sugar craving.

Also, at home and at work I just don't have the tempting stuff near me. If it's there, I'm going to eat it, so it's just easier when it's not there. Generally I crave all the bad stuff and I just try and tell myself that I don't NEED it. It's not going to do anything good for me and will only make me feel bad after I eat it. I also plan and log my meals ahead of time so I know that there's really no wiggle room for whatever it is I'm craving. Planning for me has been one of the best tools to keep me on track. Good luck!

I have a problem as well, once I start - that I can't stop
However, I recently discovered that yogurt on top of a graham cracker, or a little bit of icecream or coffee with creamer helps take off the edge...
Fruit in water helps as well
Or I exercise, then eat protein and find that the craving is gone!

I find some really cute motivational picture and quotes on tumblr, print them out, and hang them up around my apartment. You can put them on the fridge or around your room--wherever you'll see them. But I make sure they're important to me, otherwise they're useless. When I crave something, I look at the print-outs and remind myself how hard I've worked and what I'm fighting for. It motivates me to stay away from the bad foods I crave.

Depends... what's your current diet like? Open your diary.
One surprisingly common possibility is that you're simply hungry due to a large calorie deficit.

I don't deprive my self of anything I want. I just have small portions and the craving goes away. Like today I wanted a snickers so i had a snack size bar and now I'm good.

Not everyone can work that way so you have to find similar but healthy things to replace them. Fruit will often satisfy a sugar craving. Some microwave popcorn can take care of salt or crunchy cravings. I like Jolly time 100 calorie packs. Fiber One has great 90 calorie Fudge Brownies. Lots of things come in 100 calorie packs now so have some around for the tough times. Eat them slowly and savor each bite.

Graze.com

I get all my snacks from them and it is perfect portion size

I want to try it out! Unfortunately I know no one who is using this website.