What are some alternatives?
When comparing Agent Ransack and Alfred, you can also consider the following products
DocFetcher - DocFetcher is a portable German/English open source desktop search application.
Keypirinha - A lightning fast and flexible keystroke launcher for Windows. No installation required (portable).
Everything - Everything. Locate files and folders by name instantly. Everything. Small installation file. Clean and simple user interface.
Listary - Listary is a revolutionary search utility for Windows
Locate32 - Locate32 is software which can be used to find files from your harddrives and other locations.
Synapse - Synapse is a semantic launcher written in Vala that you can use to start applications as well as find and access relevant documents and files by making use of the Zeitgeist engine.