There’re many adobe reader alternatives, such as Foxit Reader, PDF-XChange Viewer, which allow you add comments, add/edit bookmarks in a pdf document, they’re easy-to-use and rich featured. If you prefer a slim pdf viewer, or you are hunting for a freeware pdf reader to use on netbook, Sumatra PDF Reader is a good choice.
Sumatra PDF is a open source and lightweight pdf reader for Windows which is developed by Krzysztof Kowalczyk, it has a minimalistic design, it’s a good alternative to adobe reader bloatware.
The setup file is only 1.7MB.
Support for drag and drop.
Multilingual User Interface supported.
Only one file so you can run it from external USB drive.Doesn’t write to registry.
Support Windows XP / Vista / Windows 7.
It uses the MuPDF PDF rendering library.
Sumatra PDF Reader download : http://download.cnet.com/Sumatra-PDF-Viewer/3000-10743_4-10698785.html