I'd suggested FTP because it not only solves the scheduled download issue, but there are also some good Palm clients (I use VFSFTP) that would make downloading these with a PDA a lot easier than using NetFront or another browser.
As a bonus, if users received individual logins to the FTP server (same as their login here perhaps?) it would be possible for admins to monitor/cap bandwidth usage.
Just my .02
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