These assets include Taobao and Alipay, China's version of eBay (Nasdaq: EBAY) and PayPal. Taobao accounts for nearly 80% of China's rapidly growing e-commerce market, and Alipay recently took over PayPal as the largest online transaction platform in the world. I've written about the importance of these assets to Yahoo! extensively, and the overwhelming undervaluation given to these businesses as implied in Yahoo!'s share price is the main reason the stock is my best idea for 2011. The sale of Yahoo!'s Japanese assets doesn't necessarily mean that its Alibaba stake is next, but it does free management to work on building a tarnished relationship with the Chinese powerhouse that was formed between departed Yahoo! co-founder Jerry Yang and Alibaba founder and Chinese business legend Jack Ma. It also gives potential Yahoo! acquirers one less difficult relationship to manage as the focus can be placed extensively on unlocking the value of Yahoo!'s most prized asset, Alibaba.