All applications and your important data are stored in RAM while the operating system is located in ROM. The general rule of thumb for memory is the more, the merrier. If possible, pick a Palm with 32MB of RAM. For Pocket PCs, opt for those with at least 64MB or 128MB of memory. If you are looking for handhelds with large onboard memory, the LifeDrive from Palm offers one of the largest storage capacities at 4GB.