JqGridAdminTemplatePlugin is a project mainly written in JAVASCRIPT and PHP, it's free.
symfony 1.4 admin generator template using jqGrid
Here is a theme that uses jqGrid instead of the default tables in the symfony admin module. I've tested it only on symfony 1.4.
To use it change 'theme: admin' to 'theme: jqgrid' in your modules generator.yml.
This is a work in progress, only the basics are supported (list).