The HP Pavilion line has been well received since the birth of its unique imprinted designs and piano-black finishes. HP has introduced 14-inch, 15.4-inch, and 17-inch Pavilion models, covering a gamut of screen options. But two models are still noticeably absent from the Pavilion family: a 12-inch ultraportable and a convertible tablet. With its 12-inch screen and tablet capabilities, the HP Pavilion tx1000 ($1,720 direct) works to fill in both blanks with one product. The tx1000 is also one of the first systems to roll out with Windows Vista Home Premium, Microsoft's next-generation operating system. But despite all the exciting new features and potential success, HP may have jumped the gun by not delivering a good tablet PC experience.