While Yahoo! Finance required you to enter the exact stock ticker symbol in the search box, Google Finance would offer matching suggestion as you type the name of the company or stock symbol.
Today, Yahoo! Finance have enhanced their quote lookup search box and it looks even better than Google - you can now find quotes for a company even if you don't know the stock symbol.
The other nice addition is multiple search - you can look for stock symbols of multiple companies in the same search box - just separate the names by comma. When you hit Go, stock data for all those companies will appear on the same summary page.