here are some pics:

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I've got the same thing here in San Diego. If you do a search here of "leaf curl" you'll see many discussions. The gist of most of them is that it "normally" doesn't affect the tomatoes and often "rights" itself, but there are exceptions. That's after making sure, of course, that you're not over or under-watering. The only one I've got that's doing it is the one in a 5-gal. container. The ones in the ground are okay, but all the same toms.
arline

davidTF

At the bottom is a discussion about leaf-curl.

If your plants are yellowing, check the symptoms for Curly Top Virus. Also take a look at Tomato Yellow Leaf Curl Virus.

I've one tomato plant and one pepper plant myself that have downward-curled leaves but otherwise they look quite healthy and vigorous. For the time being, I'm just going to watch them and see what their new growth does.

Here is a link that might be useful: Tomato Leaves Curling

Looks and sounds like a classic case of tomato leaf roll to me rather than leaf curl (leaf curl, the virus, curls the leaves from tip to stem). It is that time of year for leaf roll. ;)

"Mild, spring weather the top growth often exceeds the root development. When the first few days of warm, dry summer weather hit, the plant 'realizes' that it has a problem and needs to increase its root development. The plant attempts to reduce its leaf area by rolling leaves. The leaves curl along the length of the leaf (leaflet) in an upward fashion. It is often accompanied by a thickening of the leaf giving it a leathery texture."

No treatment is required.

Check out the site linked below.

Here is a link that might be useful: Leaf Roll on Tomatoes

Thanks alot, that looks exactly like what I have!