What's a Good Database ERD Tool for Linux?

MySQL just officially released the alpha of "MySQL Workbech for linux":

See the announcement here: MySQL Workbench 5.1 Alpha for Linux available.

I'd definitely recommend Gliffy.com for simple ER diagrams; it's an online flash-based tool. I wrote a small review of it a week ago.

MySQL Workbench is available on MacOS, Fedora, Ubuntu, Windows.

WB 5.1 is focused on Data Modeling (replacing Mike Zinner’s popular DBDesigner product).

WB 5.2 (coming April 2009) will include a ground up rewrite of the MySQL Query Browser.

http://forums.mysql.com/index.php?151