Actually, PalmOS does have a file system, but it's more like Mac's old MFS file system, in which the directories are virtual. Think reading files on Macintosh.

However, accessing a DOS formatted flash drive, either via compact flash or SMC, is availible.

There is existing code to read Memopad files, "schlep'ed" files (normal files wrapped around Palm's pdb database format...) and PilotDOC format.

But for a cheap (read: not free) scripting enviroment, you should look into PocketC http://www.orbworks.com. The only downside is that it doesn't have Internet connectivity, but thankfully is extendable.

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$Stalag99{"URL"}="http://stalag99.keenspace.com";