Geez Louise, folks. HP's notebook lineup is starting to get confusing. So confusing, in fact, that we feel compelled to offer a little primer before we get to what it is the company announced today. Rewinding to sometime last year, the company came out with its first Ultrabooks. Then it unveiled so-called Sleekbooks, which basically hold the same promise as Ultrabooks, except that for whatever reason (AMD processors, a too-thick chassis) they