Yahoo! added a new feature for Yahoo! Taiwan (Yahoo! Kimo) and Yahoo! Hong Kong search box, that enable you to now "hand-write queries on the writing panel next to search button in either traditional Chinese or English." This feature lower the hurdle for people, as searching in Chinese requires memorizing Chinese character mapping rules, and it supports Traditional Chinese, Simplified Chinese, English, and numbers.
To use handwriting feature, make sure you've Adobe Flash Player installed, then first open writing panel next to search button. When you finish drawing a Chinese character, you'll see up to six candidate characters that best match the character you drew. After you select the character you want, you may see search suggestions, saving you even more keystrokes on long queries.