Check out Dezign for Databases (Score 3, Informative)

A year ago I hit this wall. I gave up on the OSS end and decided to (gasp) buy a package - Dezign for Databases by a company called Datanamic. $150 for the full version - you can use all kinds of DBs - Postgres,Mysql,Oracle,DB2,etc,etc. I will also do Access conversion stuff, but I have never played with that. There is talk that they will release a Linux version. As of now it is only Win32, but it is work every penny. It has saved me tons of time.