This may well be old hat to you, but I just learned it myself — if you want to link to a particular page in a PDF, you can do that by saying something like,
http://www.law.ucla.edu/volokh/2am.pdf#page=5
In a triumph for computer programmers — but perhaps confusing to most others — the pages are numbered started with 0, so that what most people would think of as “the third page of the document” would be #page=2.
UPDATE: Well, this is bad: Following the link using Chrome treats the page as numbered starting with 0, but doing it using Explorer and Firefox does it starting with 1. So this means that this feature is pretty much impossible to use effectively, since different users will be using different browsers. Arggh.