I'm talking about books in general are easier to search electronically, not encyclopedias. Even encyclopedia's, though, when looking for a specific excerpt within an article, when you can't remember the article, it can be a PITA. Happens to me all the time on Wikipedia, thankfully Opera has a very effective caching system that allows me to search almost all the text content of a page just from the browser history.
That's true I suppose. Never ran into that myself, as the only books I ever desire to find specific excerpts in are academic works, which generally have excellent indexes. And articles are usually short enough that a bit of skimming through the text will get you what you need fast enough. But scientific journals are usually available in digital form, so it's even less of an issue there. I guess I'm just old fashioned though, I love the look, smell and feel of printed books.