to encode them, download the program known as SUPER to encode the FLV file into a format suitable for your needs altho you need plenty of space and a decently powerful CPU for a successful encode altho this program is supposed to be a lot better than a lot of the paid encoder software out there [and believe me, I've tried a lot of them!]
I'm not too sure if there's any programs that are free that will only run on 16MB of RAM and in any case, I'd suggest upgrading to as much RAM as you can afford!
As for downloading from pandora.tv and naver.com, I've never heard of those sites and I don't know where you can download from them...