If you are looking for a EVDO card for Powerbook, I will recommend, Sierra Wireless Aircard 580, which after some hacking gives you better performance than any other PC card. However, it doesn’t work as well with Windows Laptops. It was giving me about 350 kbps on Mac and 115 kbps on a PC laptop. Novatel’s Merlin v620, however is a solid and brisk performer on Windows Machines, with average speed of about 270 kbps. It got 115-120 kbps on a Mac. The comparisons were carried out using Powerbook 15 (Tiger) and Averatec 1000. I sat in the same location for the two laptops, and repeated this experiment in four different spots in San Francisco. I look forward to your feedback from other cities. Kyocera 650 is known to work well with a Mac. Folks over at EVDOinfo.com have more details. These recommendations are only for Verizon’s EVDO service only.