Here are a couple nice screenshots of Tim Roth as Guildenstern and Gary Oldman as Rosencrantz compiled by a serious fan of the play and the film. The URL won't take you right to it, but the page is easy to navigate. Just click on "Pictures" and then "Rare/random pics."
A nice photo of Stoppard from the New York Times.
A helpful overview of Stoppard's career and what he has contributed to the theater.
A nice, lengthy interview where Stoppard talks about how he writes, the difference between the London and New York theater scenes, and where all the aphorisms and puns come from.
A recent profile of the author and his contribution to the theater, printed in the London Telegraph.
The original review of the play after it opened at the Alvin Theater in New York. To this day, many printed editions of the play keep the quote "very funny, very brilliant, very chilling" that comes from this review.