This morning I wanted to look something up in a book I bought for £1 in the SCM sale when I was a student almost 15 years ago.  I wasn't sure, but I thought it had an orange cover, so I looked at the orange books in the right part of the bookcase before scanning along the shelves without success.  So I looked it up on the web, found a photo of the cover, discovered it was blue, and now on sale at £15 or thereabouts.  With this new information I quickly located the book, found the chapter I was after and read some stuff that will be helpful for my sermon on Sunday.

Not sure that's quite what the web was meant for, but it's useful!