The latest version of Adobe Reader software embeds Y!Q contextual search in PDF files that are currently open. What that means is you can perform a Yahoo Contextual (Y!Q) web search directly on text selected from within a PDF document.
If you select text, either a single word or phrase within a PDF, and right click with the mouse, then you are presented with menu item that allows you to use the Yahoo Contextual (Y!Q) Search Engine. If you don't plan to use this feature, download a lightweight version of Adobe Reader.
Apart from Yahoo search, there are some bug fixes in Reader 7.0.8. If you are upgrading from version 7.0.7, the "Display PDF in browser" preference is not saved.
Adobe Reader 7.0.8 Full Version (Includes Yahoo! Toolbar and Adobe Photoshop Album Starter Edition)
Download Adobe Reader | Y!Q Search | How to embed Y!Q Search in Webpages