When you cite a Web page in your article -- or in a court opinion -- you run the risk that the page will be gone by the time some reader of yours will want to check it. The obvious solutions are to archive the page, either on some site that you've committed to keep up yourself, or on some site run by an organization devoted to this purpose. Likewise, publishers (such as law reviews) may do the same for articles that they publish. And I know there are organizations that do try to do this, at least in theory.
My question relates to the practice: Have any of you done this systematically for your own works? Have you used archiving services, and what has been your experience with them? Are there unexpected technical issues one needs to worry about when doing this? I'd love to know, and I imagine that so would many others.