I have the book (on Kindle) Find Love in 90 Days and I'm not afraid to admit it. But I haven't really used her plan.
Sometimes I read Evan Marc Katz' blog, too. And Typisch Mann (in German), although I think he's a little too negative.
Also read a husband-hunting guide that gives me hope, although I don't know if I trust the source.
ETA: Almost forget Date Like a Grownup blog for women over 40, but she's said she has younger readers, too. Also very practical.
And I'll add Christian Sanders' (in German). Kind of basic stuff, but not bad.