Google Print
This may be old news, but I recently discovered Google Print. This service will searched published, printed works for keywords and display actual previews from the text with the keyword(s) highlighted - brilliant!
Here's a link to my name in Ben Forta's Regex book.
http://print.google.com/print?id=Xrd6z2NMNawC&pg=iv&lpg=iv&prev=http://print.google.com/print%3Fie%3DUTF-8%26q%3D%2522scott%2Bvan%2Bvliet%2522%26btnG%3DSearch&sig=EtGjIpr2_BsWrBuphqzW-kC70vU
I'm not sure how many printed works are cataloged; I couldn't find works from some popular authors that I know of. But as always, it will be interesting to see what the Google folks will come up with next.