I wonder if we should not be making our choices based on the ability for the tool, application to be student led and driven. It's interesting how successful blogging is for many students. Why I ask? It puts the learner in the driving seat, they are in control leading their own learning. Like Facebook (for better or worse)- the interface is intuitive, no manual is required to use it and you create your own profile, contacts etc for your own needs and purposes.
Maybe we should be purchasing the new small portable computers that are wireless and connect to the web so that more students get their hands on and are involved in the 'doing' of learning.
All interesting thoughts to ponder? Are we not better to buy a few one off pieces of hardware and give them to students, observe what happens and then purchase from student feedback and consultation? We are ignorant and maybe arrogant to not be led by students as they are the digital 'natives' we the digital 'immigrants'