Automating import, overcomming 2MB limit

I'm exporting a home-made blog server with 3,400+ bloggers to WPMU and looking for a way to automate the procedure so my users don't have to export then import themselves.

Can anyone point me in the right direction? Someway to feed the WP import function and overcome the 2MB limit of the manual import?

Many thanks in advance :slight_smile: