There are such devices as `television standards' converters used for that very purpose. And since the television industry is going all digital, it probably won't be long before you can get a used one...
No, an NTSC telelvision will not display PAL signals properly. However, many modern telelvisions are multi standard and will show either PAL or NTSC signals. In these cases, using a PAL DVD output,...
To play ntsc games on a pal console you need to overide the consoles security, for this you can just buy magic swap DVD with the slide tool. You can buy swap magic from here....