Hi all:
I developed a "draggable" contact application "Group Contact Lite"
and I am here sharing with you. Th app is free on google market now.
It support English, Chinese currently.

The concept of this app is that:
I assume that the number of the contacts in a group you most frequently connect is about 3~4, 8 the most.
So, when the app starts, you can directly see the most frequently connected contacts of each group shown on the index.
The contacts are sorted by connected times.
you can also pin the contact you like on the top.
So, you can find your friends that usually call very fast.
And the contacts are draggable, which means you can use drag&drop to manipulate your group membership. It also support multiple contacts dragging!
The displaying order of the group can also be modified by yourself.
It also support user plug-in, you can develop your own function for contacts and plug-in in to the app.
There are some other screenshots
This is my first app for android : D , hope you would like it!
I create a discussion area for bug reporting and wishing well for apps.
You can post you comments and suggestions to app in English or Chinese.
Group Contact Facebook Page:
Group Contact | Facebook
Group Contact google site for developing plug-in
https://sites.google.com/site/magicstudiogroupcontact/issues
you can download the app from market by the following QRcode:
Thank you very much

Enjoy it.!