Tomorrow night Yahoo is planning to unleash Search Pad, a note-taking tool integrated with the search engine, to the masses. The company first showed off the product last February, but until now it hasn't been available for public consumption. The new feature will go live to the general public tomorrow night at 9 PM, PST.Search Pad is pretty similar to a host of other annotation apps that are already out there, with competitors that include Google Notebook. The biggest difference is that Search Pad tries to pre-populate your notes. For example, if you start running a number of queries related to a certain car model, Yahoo will detect that you're going to 'research mode'', and will then present a small bulletin asking if you're like to launch Search Pad. If you click yes, the last few queries (in this case, the ones pertaining to the car) will already be in the text field.