Firmware 3.03 OE-C vs. 3.10 OE, 3.40 OE, etc

I'm currently running 3.03 OE-C, but I was curious as to what differences the later custom firmwares have other than improved PSX emulation. Anyone have any ideas?

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Easy support for playing any new games that do/will require higher firmwares. Other then that and what you already mention, I am not to sure. O and you can plug it up to your ps3. And they will play more iso's(same as playing newer games I guess). But all I know of that 3.03 has on 3.40 is like better xmb customization or something like that. I don't see any problem though with 3.40 I customize the xmb all the time and haven't had any problems.