http://www.shape.com/healthy-eating/diet-tips/9-low-carb-snacks-eat-go

I love Shape magazine and the website is also very informative! They have lots of great diet and exercise tips and one that I like is the low carb snacks you can have on the go.  Remember...if you are prepared and have good food on hand you will have no excuse to eat bad foods when you are out and about!
These are great snacks to have at home as well...
I haven't tried the apple muffins yet but I will soon and let you know how they turn out.  
Enjoy!