(adsbygoogle = window.adsbygoogle || []).push({}); If you've jailbroken your ps3 I'm guessing you also have jailbroken/unlocked other devices.
The first that comes to my mind it an iPod touch/iPhone.
I've also jailbroken my ipod touch. I remember seeing "top 10" lists for reasons for jailbreaking.
I haven't seen anything like that for Ps3 jailbreaking.

I'm sure everyone and their mom knows that you can host CL's in MW2 with a jailbroken Ps3.
I'm wondering what else you can do with it?

I personally can only think of a few things.
1. hacked lobbies in mw2
2. play games off backup manager --- not sure about it, if you know a tutorial, link me please.
3. homebrew games --- Really have no idea about this.

I've seen people complaining that n00bs only want to jailbreak for mw2 CL's because "there is so much more you can do."

So now I'm asking what else can I do?

Yeah they are only playable on a jailbroken PS3 as they require a backup manager to work, and backup managers will only run (because they are unsigned), on a Jailbroken console