Check out Yahoo! Open Shortcuts. Turns the Yahoo Search box into a command line, letting you type things like:
!my to navigate to "http://my.yahoo.com"
!wsf to search "weather san francisco" on Yahoo!
To create a common search shortcut, use the keyword: !set with your shortcut name and the query.
!set shortcut_name query
Similar to Yubnub, which also adds a community-based feature.