Ps3 – Transfer Call of Duty MW3 save from PC to PS3

Yes, as long as you use the official memory card adaptor: while they might work fine for reading, third-party adapters are hit-or-miss when it comes to writing back to PS2 memory cards.

PS3 Explained has a writeup, but the general workflow is:

1. Connect the memory card adapter to the PS3 via one of the USB ports in the front and insert the physical PS3 memory card.

2. Under the Game section of the XMB, select the Memory Card Utitlity (PS/PS2) option, navigate to your virtual memory cards, press △, select the "copy" function, and choose the physical memory card.

All your purchases and DLC are bound to your PSN account, not your console. If you deactivate your account on your old PS3 and activate it on your new one, you'll have access to exactly the same content (although you'll have to download it again unless you perform a backup/restore or direct transfer, which would also move any copy-protected saves you might have).

The exception to this is if you intend to keep your old console activated: You can have up to five PS3 bound to a single PSN-account, but (due to a policy change) any content purchased after November of last year will only be available on two consoles at any given time.

You may download any content you've ever activated (paid, promotional or free) as many times as you want, it will stay in your download list forever. (Source: I've had a PS3 since relase, and even though I've replaced my fat one with a slim, my download list still contains the very first DLC I ever bought)