One of my mighty hunters laid a present on my doorstep tonight. One terrified widdle wabbit. He appears unhurt, and is resting comfortably in (ironically) a cat carrier with a old towel for warmth. He is about 5 inches long in his natural crouching state. I think I know where his nest and mother are but it is going to get cold tonight (30s) and I figured his best chances would be inside tonight. Is he old enough to fend for and feed himself ? If not, what/how often should I feed him ? Is it true that his mother will reject him because of the human (not to mention cat) smell on him ? What is a baby rabbit called ? Any good rabbit veal recipies 
You is a good person, Oblio. I did a quickie Google search (rescuing wild rabbits) and found a few sites that look helpful:
Orphaned baby rabbits and
rabbits and Wignall Animal Hospital.
I just scanned them but the consensus seems to be that it’s very, very difficult to keep a wild baby rabbit alive and healthy. Take a look and see what you think, though.
Good luck to you and Thumper.
Veb
Get thee to a rabbit society or vet. You can probably keep him/her overnight or so, but after that, I wouldn’t recommend it. I’ve rescued cottontails and baby jacks before, and it’s really hard, as rabbits tend to be delicate. Go to http://www.rabbit.org and see if there’s a chapter near you, or, failing that, call your local humane society and see if they have any advice. If you know where the nest is, by all means try and put it back. Mama rabbits won’t usually reject their offspring because of human smell, but it’s not exactly Chanel No. 5 to them, either. Good luck and Godspeed, little lagomorph.
Watch out for ticks, though; the wee beastie is likely covered with them. I found an infant rabbit that had fallen into a gutter once that I took care of for a bit… I tweezered several dozen ticks off him. And he was only as long as my little finger.
I didn’t positively identify them as deer ticks (Lyme disease) but they were awful small. Ya can’t be too careful.
More than a vet even, what you need is a wildlife rehabilitater(sp). Here is a site which lists rehab centers around the world. I notice that your profile says you are in Georgia, there is one listed here in Ellijay. Also at the top of the page is a link to other rehab centers who aren’t on the web.
First and foremost, do not feed this bunny. If he is injured in any way, feeding him would be a death sentence. Rabbits are also notorious for hiding injury, and will appear perfectly healthy practically up to the moment of death. Dont offer him water either.
Keep the bun in a dark, quiet, warm place. Try to interact as little as possible with him. These little buggers are cute as hell, but too much stress can be deadly to him.
You can help the bun stay warm by placing a heating pad set on low underneath the cat carrier, or filling an athletic sock with dry rice and microwaving it for two minutes or so (touch it to you face when you take it out, it should be warm but not hot). Overnight I would go with a heating pad, but you can use the rice bag tomorrow on the ride to the rehabbers.
Also if you can, substitute an old t-shirt for the towel. Little toes can get caught in the loops of terrycloth and get snatched off.
You are a great bunnyfriend for helping this little one. Best of luck to you.
Oh, and in case its not obvious, tie the sock in a knot after you fill it.
Silly me, always forgetting the details. 
I don’t have any advice really, but I’ll tell you my own baby rabbit story…
One of my cats (when they used to be allowed outdoors) brought a baby rabbit in through the cat door. I was watching a movie and looked up the hallway and saw something hopping. At first I thought I was seeing things, but I looked again…“wha…??” It was an apparently unhurt baby bunny, a tad larger than the bunny you have, but still a wee one. Have you ever tried to catch a wild baby bunny loose in the house? It took us about two hours, at one point we actually bumped heads (me & my ex), the rabbit had gone behind a clothes hamper and we both had our heads down looking, and when we looked back up…clunk. We finally cornered him behind our huge entertainment center, thought we had him and he slipped right through my hands. Baby bunnies are slick…and fast! Got him behind the entertainment center again and herded him into a cat carrier. OK, don’t read the next part if you’re sensitive. I’m sorry, this story does not have a happy ending.
We had three of our four cats indoors and accounted for, but Sammy, Loner Cat, was still outside and wasn’t coming in, despite our calling him. We thought Sammy was in one of the fields out back, so we took baby bunny out front to set him free. We took the cat carrier outside, opened the door and let the bunny out, he sat for a few seconds and then hopped away. All of a sudden, out of the darkness, Sammy came racing from the backyard and grabbed the bunny and ran off with it. I was very sad. 
That’s what Sammy was though, the ultimate hunter.