What is a CLE or Cloud Learning Environment? - The cloud can be seen as one big autonomous system not owned by any educational institution/organisation.
Let the Academics or Learners be the users, of some cloud based services, where both share the same privileges like control, choice, sharing of content etc on these services. This control is different from that in a PLE, a VLE or a PTE. If needed, the academic and the learner can have same rights to the shared content. For example, each "Google Site", can be owned by an academic or a Learner and both users be given the same rights/control by one another (depending on who creates first). Likewise Google Docs can be owned and shared between learners themselves or learners and academics under their own control.
This clearly has potential to enable and facilitate both formal and informal learning for the learners in an institution. Both the academic and the learner are free to use the tools the way they wanted and with anyone they wanted. This would not have been possible if the tools used were chosen / managed by either the academics (PTE) or the learners (PLE) or for that matter the institution (VLE). Google Apps was not designed just for institutions or for individuals, it was designed for collaboration both within and across institutions (CLE).
CLEs also make it very easy to generate content and share it with the rest of the world in a DERPable (Discoverable, Editable, Repurposable and Portable) manner, in the spirit of the UKOER programme.
Lastly, students at my institution love the Google Apps interface, which makes it very easy to get them to engage with their work using online tools. This can be seen from the crazy usage statistics of Google Sites where I now host my Examopedia.