Sometimes I'm lucky and sometimes I'm not. Today I was lucky. The Eisenhower looked interesting and I like presidential biographies. MacDonald is on the list just to say I've read a Travis McGee. Levin made it into the pile because of the narrator; I know him. Agatha Raisin made it because I like the first one and I'm happy to read more. Finally, the Rabbi made it because I remember the series from my youth, when it was just being published.
I also found a number of other books I would have gotten if they weren't already on my bookshelf.