Mine are doing the same thing. I also believe it is a deficiency. I have not given them any fertilizer yet. I'm going to give them a little and see what happens.

Too mucho aqua. Too much water ?

No I am not overwatering. Was potted up in miricle grow potting soiL at 6 weeks or so. have not used any fertilizer but think it must need something but i dont know what. I would like some of the experts here to comment as I know I am not the first to experience this problem. I searched and could find no reference in past post.

cupped up or down?

Mine are cupped up to the extreme.
Relieving the green house heat and humidity makes them uncurl.

In my investigation into the problem I also read the cause could be too much Nitrogen and a host of other issues.
I base my information on this link(and others)
http://wiki.answers.com/Q/What_causes_leaf_curl_on_tomato_plants

I cannot vouch for it's accuracy.
I do know that reducing heat, humidity, watering, as pointed out in the article, helped me.

elskunkito
Thanks for the link. I read and think the only thing that could apply in my case is wind. It has been windy every day for a while. The plants were hardened off slowly and have been outside all day and night for last month, except 3 nights where temps were in the high 30s. They were brought in the garage overnight then.I water every third day and they have never wilted or shown signs of sterss other than this upward curl. Artical stated they will be ok in time. It is affecting all plants not just random so i was thinking it was a nutrient def. Any others want to comment? All help and advice appreciated.

It is called "Tomato leaf roll" and is a common symptom of physiological stress. Poses no threat to the plant. ID the stress and eliminate it and the problem disappears.

Normally there are several discussions here about it but I searched and all but a few seem to have been lost in the recent server problems so linked the info below instead.

Dave

Here is a link that might be useful: Tomato leaf roll

digdirt
Thank you for your imput, I think it can be narrowed down to cool rainy weather and possably wind contributing to problem. They have been outside for a month now and it has been cool and raining. I read most post here and had read of this before but couldnt find thread.I am giving out 40 or so plants to friends and fellow gardeners this week and didnt want to give out plants that might cause problems for them.Thank you.