[eluser]rogierb[/eluser]
Never tried porting wordpress but have ported a couple of small;-) databases holding a few millions records.
Since you only have about 3000 you can do it in a few different ways:
teh fastest: export data to xls/csv and use something like ultraedit to create insert statements. Should take you about 2-3 hours
Teh slower but more dynamic way is to create an export script that generates a database dump in the new structure
Another way is to create an import script that connects to your wordpress db and reads all records, converts theme and inserts them in to your new db
The last method is prefered since it can be reused. But for limited record I prefer a combo of xls and ultraedit to crete insert statements