A new version of Database Navigator plugin is available (3.0.1753)
Main new feature is the CLOB editor with content type selector. The feature is still experimental and is currently working only for Oracle. For MySQL, the clobs are only visible but can not be edited. Additionally, compatibility issues that prevented from using the plugin with WebIDE and RubyMine have bin fixed.
Plugin builds are available for IntelliJ 8.1 as well as for 9.0 (IU and CE), for both JRE5 and 6. See plugin repository page for more details.
Please feel free to report any issues in the dedicated request tracker: