I use an OpticBook 3600 scanner, which is made with a narrow edge to allow scanning close to the binding. It takes me about an hour to scan a 250 page book. Other people use the Fujitsu SnapScan S1500 (I think), which has an automatic document feeder with duplex (both sides) scanning. Of course, you have to cut off the binding (messy) to use it, but it is much faster. Both cost $300-$500, and include OCR software.
See our wiki pages on ebook conversion, and our Workshop forums, for lots of good info.
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