Handspring isn't the only choice anymore when it comes to modem modules. Card Access will be releasing its Thincom modem later this month.
One of the most appealing aspects about the Thincom is that the module appears to be a standard size Springboard module. Those who were bothered by the Handspring modem's size should check the Thincom out. Card Access will be one of the companies in Handspring's booth at PCExpo, so you can expect more information then (if not sooner).