Whatever your feelings about Nintendo's online service, it's starting tonight.
You get a week of free access and then it's £17.99 for a year. This is the cheapest I've found for a year, so far.
You get online play, cloud saves/backups and "free" NES games to play.
Be interesting to see how the service evolves over time, they've got a long way to go to catch up with MS and Sony!