Tiger’s Spotlight promises to quickly find anything on our Macs, but you may be overwhelmed by 1500 “hits”, 1400 of them images. It would be useful to refine your search.
If you know that you are looking for specific types of information, you can specify that in your search phrase by adding the text “kind:<type of information> after your search. For example, to find all of the PDF documents related to Yosemite, type “Yosemite kind:PDF” in to Spotlight.
Find much more information and a full list of kinds at Spotlight Tips.