"The Software Store has gone mobile. Browse and download over 5,000 apps & games right from your Palm device. Plus, there are over 1,000 free apps to choose from. The mobile software store supports over 25 Palm devices1, from the Centro to the Treo Pro."
If you have a Palm device, be it PalmOS or Windows Mobile, Palm has created an application store you can browse, purchase and download directly from your device. There is a link for PalmOS and Windows Mobile devices to download the store application. I've not tried it to see if it verifies your Windows Mobile device is really from Palm.