I think every bunny is special, they don't need to be "special needs."
By special needs I'm guessing you mean rabbits with chronic health problems or birth deformities. They require a lot of money for vet bills (as well as a good rabbit vet), generally more time every day to take care of, and preferably a more experienced person who is good at recognizing the small, hidden signs that a rabbit is starting to feel worse. I'm not saying you're not capable because I don't know you at all, I'm just saying that it's not something everybody should run out and do.
But you don't have to have a special needs bunny of your own to make a difference for rabbits. All rabbits in shelters and rescues need help, you can donate to them or volunteer with them. Even a small donation, such as a $5 bale of good hay or a few toys, are appreciated. I volunteer for just a few hours every week at my local shelter and let me tell you it makes a difference! One bunny went from being an aggressive problem to a back rub loving favorite since the other volunteer and I have been working with her. In another case I helped answer questions that a prospective adopter had about bonding rabbits, and it gave her the confidence to go ahead and adopt the bun.
You can also help rabbits that belong to other people by encouraging their owners to learn how to take care of them better. Tell them about this forum, the House Rabbit Society website, and other great sources of information. Tell them how good hay is for rabbits, that pellets with treats in them are unhealthy, and how many rabbits are waiting for homes in shelters (also don't breed unless it's for show purposes).
This is kind of convenient, but next month is Adopt a Rabbit Month and I'm hoping to get an article written on all the different ways people can make a difference for rabbits, whether they have time and money or not.