My opinion regarding the TI-89: Good, and it's about time, and WHY doesn't it include the geometry package from the TI-92 and ***WHY*** doesn't it include the statistical package from the TI-83???
I can forgive TI for not including the Cabri geometry - their stated market is college engineers. BUT, not to include the statistical package is insane, and I told their reps that at NCTM and at a later workshop given by my school district. I have students who take both the AP stats and the calculus (I teach both). Which machine do they buy? The downloaded stats package from the TI website - also required for the TI-86 - is inferior to the 83 built-in version. However, the CAS and differential equation capabilites of the 89 can't be matched by the 83. <sigh>
HP has already had a CAS calculator approved for the exam. But, as is true with all technology, if you don't *understand* the mathmatics, then all you're doing is punching buttons. One of students two years ago showed me his HP and its CAS. He still got a 1 on the exam.