The idea of PLEs, as I see it, is connected with mobile learning. However, we have to be careful not to connect the idea of mobile learning and PLEs with expensive technological devices. Mobile Learning is a combination of two words and both of them should be given equal weight. Mobile learning, if the second word of the expression is given its value, refers more to the learner than to the device or technology. Mobile learning has to do with being able to learn anytime and anywhere.
What motivated me to present on PLEs was my experience with e-learning. I first heard the term on Teemu Arina´s magnificent presentation Serendipity 2.0 and saw that it had something to do with the way I had been learning for the past two and a half years. While reading for this presentation, I was pleasantly surprised to find out that PLEs are not a tool or an aggregator, but a way of aggregating learning, a way of morphing the tools, people, machines around your own personal learning. So, PLEs are defined largely by the learner and his learning goals.