Hi Yong Mook Kim,
I have been an avid user of the DiggDigg Wordpress plugin for a long time. I think yours is one of the slickest available.
I was wondering whether there is a chance of getting our App BufferApp integrated into DiggDigg.
We currently have a standalone WP-Plugin available here: http://wordpress.org/extend/plugins/buffer-button/
And also the code to add the Button without a plugin here: http://blog.bufferapp.com/say-hi-to-the-buffer-button-for-blogs
What it allows you is to add to your Buffer instead of Tweeting right away so your not flooding your followers with tweets at once. Buffer spaces your tweets out for you throughout the day.
I hope you can let me know if anything is possible. I gladly provide you with everything you need.
