Google's document viewer has a better search feature: you no longer have to manually locate the matches in the document. After performing a search, press Enter repeatedly to find the matches or click on the arrows placed below the search box.
The document viewer is used for the PDF files uploaded to Google Docs, for PDF/PPT/TIFF attachments in Gmail, for some PDF results in Google search and as a standalone service.
For some reason, Google Docs still doesn't index PDF files, so you can only find a file only if you know some words from its title.
TNG Edits, "Riker"
49 minutes ago