So I found this in my research on ZigBee and felt they have the best explanation that I have foun...

[G+_Jason Perry]

So I found this in my research on ZigBee and felt they have the best explanation that I have found so far.  They do a good job explaining the difference between 802.15.4 and ZigBee.

 

I guess I should also check out their products since I like their videos so much

https://www.youtube.com/channel/UC7kbbFnMLhvS6P7Spm8gkNQ

[G+_Ben Reese]

I found this PDF earlier too that explains some if the differences. It also seems like it's mostly for marketing.

http://www.digi.com/pdf/wp_zigbee.pdf