The article describes and discusses the learning potential of unofficial techno-literacy activities in the classroom with regards to Swedish 7-8-year-olds' exploration of semiotic resources when interacting with computers. In classroom contexts where every child works with his or her own computer, such activities tend to take up a substantial amount of time. The children have access to a wide range of sites and programs and show an interest in discovering these resources. The article thus explores a previously often neglected site for learning, located in the official classroom context but involving self-chosen activities with contemporary technology. In terms of theory and methodology, social semiotic ethnography is introduced into the field of young children's techno-literacies. It is illustrated how a social semiotic approach allows for a more detailed analysis of the semiotic resources, whereas ethnographic data are necessary for an understanding of how such resources are put to use. (Contains 3 notes, 2 tables, and 9 figures.)