Start with the ADO.NET version of SQLite:
http://sqlite.phxsoftware.com/The only problem I think will be that you have to load nss3.dll for some specific decrypt functions, but we'll see.
You also might want to take a look at how Google Chrome write it's importer for Firefox:
http://src.chromium.org/viewvc/chrome/t ... iew=markup (browse to parent to see all files).
If I have time upcoming weekend, I'll take a stab at it.
Sincerely,
Nick Kusters.