Group work for single or small numbers of computers. Integrating the curriculum supports this ability to split the tasks over a number of stations, writing, art, technology, computer work etc. Quiet timers set to half hour intervals, negotiation on work tasks, contracts etc. I teach with a 5 computer model and write standards-based lessons for Internet delivery. With these lessons, several classroom strategies are included that have been tried by the author, piloted by at least 2 other teachers, and revised.
Students rotate through several activities, some of which involve their use of the computer.
I also have a scan converter connected to a TV for whole class instructional usage. No, With older kids I might. We do not have specific computer times or timetables. They are there for the kids to go to when they have finished other set tasks. These kids have very short concentration spans.