A reusable tree widget with the following features:

1. It's reusable for different table structure that stored the data of nodes , by using a abstract DataHandler interface.
2. It can deal with the large quantity of data with the ajax mode, and load all nodes in one time;
3. It can directly load nodes from the plain JSON object, or from the XML url;
4. If you're using DWR/Buffalo, it also provides an AjaxDataProxy for the external Ajax framework;
5. It's still on the way. I will make it more pretty in the future.
6. Finally, my English is not so good. You can visit my blog to get more details about the widget. Of course, what about your Chinese? :)

To my chinese friends

1. 以我目前的英文表述能力，可能难以真正描述出这个小组件的特色．还是来点chinese!
2. 如果单就UI层的展现效果来看，它并不出彩．比它更cool，更炫的树组件网上很多．所以，前台不是它的闪亮点！
3. 它的最大亮点在于后台通用性！在于一个统一的DataHandler，实现对后台节点数据获取的封装隔离！
4. 它的节点数据可以来自于任意数据库的任意结构的数据表，一张或者多张，又或者是EJB/webservice从远程取到的数据，还或者是其它外部数据源．
5. 当然，它所包括的特性并不限于这点．在真正体验过之后，也许你会发现更多有意思的功能

如果有兴趣的话，可以到我的blog上，看一下关于这个Tree组件的专题日志介绍