If you're a newbie to Linux, I recommend that you do nothing with the new ext3 features in the kernel. There will not be any immediate benefit to you.

The biggest benefit is "no disk checks", but that is already there in Hijack because it has a menu option "Filesystem check on sync=Disabled" that you can use.

As a software developer, there might be some benefits to using ext3 on the player, but if you're just a regular user then you shouldn't convert your file system.