The first wave of Intel Ultrabooks are coming. A leaked photo of the Acer Aspire 3951 Ultrabook has the ultraportable market buzzing this morning. As the first legitimate 2011 MacBook Air alternative for Windows users, the Aspire 3951 will be an eminent threat when it launches this October. Not only will it nearly match the MacBook Air in size and dimensions, the Ultrabook will be priced less than £849.