I do thumb drives with the micro to mini B (see host mode made easy thread), and a mini-b to A female. Or actually I have a number of microSD keychain USB drives as well - I just leave the microSD in the thumb drive where it is protected, and swap there often several times per day instead of some other method. At MicroCenter, 8Gb thumbdrives are $29.95, and I think newegg has them for that price too.