Maybe a more formal way of posting porting prospects would be good. A forum post or a wiki page (wiki would be better to maintain, but a forum post might get more participation) with a list of game suggestions that could be ported, who is working on them if anyone, where they can be found, etc. In a forum thread the starting post could have a well formatted list and instructions for replying with an additon or claiming a port and so on.

As for campaigning for closed source games, having seen how it is with desktop linux I'm not too optimistic. I guess such a thing may have led to a port or two, but I'm not sure and it's always a lot of work with very few results. I'd concentrate on small and indie publishers if doing this.