If someone has a Kezayit of cake, for example, and he finishes it without having blessed before eating it, does he make an after-blessing?
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Yes, he makes one. Source: The Halachos of Brochos, by Rabbi Yisroel Pinchos Bodner, (self-published, distributed by Feldheim, 1989, second printing, March 1990), chapter 15, section C.2, citing Magen Avraham 172:2 and Mishna B'rura :3. (The Machatzis Hashekel there notes that this is obvious.)