Yasin's favourite at the moment is Mulga Bill's Bicycle.
He can recite about half of it on his own.
He also loves Everyone's Got A Bottom (Cailin posted a thread about it somewhere) and he's taken to pointing out bottoms while we're out and about.

Imran's into Who Sank The Boat and Rosie's Walk.

We bought Diary of a Wombat. I love it but the boys don't seem to get it.