NOTE: Dry ladyfingers are known in Italy as "savoiardi." They are sweet, little, fairly dry cookies that are finger-shaped. Look for them at Italian markets and specialty food shops. Some popular Italian brands for ladyfingers are Alessi, Balocco Forno, Bonomi, DeLallo or Roland. For soft ladyfingers, they are sometimes found in refrigerated case, sometimes with cookies and sometimes available in bakeries.
If using soft ladyfingers, they need to be air dried before using in Tiramisù. Arrange ladyfinger halves in a single layer on a large baking sheet. If you like, cover loosely with paper towels. Allow to stand at room temperature for 24 hours.