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David,
I'm willing, but not sure how, to help with the information you've provided. You need to include a little more data so we can try and help you figure out what happened and how to prevent another occurrance.
1) Can you explain exactly what happened. For example, Were files replaced/deleted? Were additional files added?
2) You said you upgraded to 2.0.14 so I'm assuming this was completed. Can you explain exactly what steps you went through when upgrading. For example, did you reset mainfile.php to read only rights (CHMOD 444)? Did you delete the install and/or upgrade folders when you were done? etc.. etc..
3) Do you have access to a web stats type program (AWSTATS, etc) to help identify a visitors IP address, etc.?
4) Do you have a backup of your site or is it 'repairable'?
EDIT:
5) What other modules do you have installed?