in his
latest alertbox Jakob Nielsen talks about how to "spare your users the misery of being dumped into PDF files" by creating special gateway pages that "summarize the contents of big documents and guide users gently into the PDF morass." Another, less costly solution I've used is to link directing to the relavent page in the PDF rather than just the first page. This is how I have my
Portfolio page wired up. Each short description links to the specific page and set's the page zoom to 100%.