Well i heard about a guy selling his method of jailbreakin the PS3 with just a usb drive for 150$….i dont think that i am very desperate to jailbreak my ps3 by spending 150$,but now you can mod or jailbreak your ps3 if you have an iphone android phone.But you cannot jailbreak the PS3 from any android device,there are some specific devices,you can check out which device can jailbreak here.If you device makes the list then you can jailbreak your PS3 by this method
I would also like to point out that this can realy harm your PS3 if not done properly and that sony can stop you from playing online even if this is not illegal!
I have not tried it yet,but i will,soon..currently i dont know what jailbreaking can actualy do to your ps3,but i think you will be able to put in different o.s versions or change the roms might be!I guess you might also be able to play your old ps2 games.