BookFinder.com's most sought-after out-of-print books in 2007 (with BookFinder commentary) are:

1. Once a Runner by John L. Parker, Jr. (1978). Cult classic distance running novel (long-awaited sequel, Again to Carthage, released November).
2. Football Scouting Methods by Steve Belichick (1962). Legendary college football scout's playbook, used by coaches and players.
3. Sex by Madonna (1992). The pop icon's book of erotic photos, a perennial favorite.
4. Promise Me Tomorrow by Nora Roberts (1984). Early novel that the bestselling romance novelist refuses to reprint.
5. The Lion's Paw by Robb White (1946). Enduring children's adventure story.
6. The Principles of Knitting by June Hemmons Hiatt (1988). Ultimate indispensable hand knitting resource.
7. Raven: The Untold Story of the Reverend Jim Jones and his People by Tim Reiterman (1982). Chronicles the inner workings which allowed the People's Temple to flourish.
8. Aran Knitting by Alice Starmore (1997). History and how-to about the Irish technique.
9. One Way Up by John F. Straubel (1964). History of helicopters and vertically rising aircraft.
10. Dear and Glorious Physician by Taylor Caldwell (1959). Novel based on the life of Saint Luke.

[Many thanks to BookFinder.com!]