I've surfed several comprehensive disease id site but none of the examples fit what I have visually. Can any one help me id and suggest a solution? I live in tropical malaysia.

Welcome richysam! I hope someone can answer your question; I have some tomato plants doing the same thing.

There are a few things that can cause it - does anything described on this link seem to fit?

http://www.clemson.edu/extensi...

I've put in a request to move this question to the vegetables and fruit forum because there are a few tomato discussions going on there. I wondered also about the pests and diseases forum but in the suggest a change option I had to pick just one forum.

It may match 'Little Leaf'... what do people think?

It does look like a possibility. I think I am going to give up on my plants; there has been no improvement. Are yours still afflicted?

I would guess not many of us are familiar with growing tomatoes in the tropics. I might guess it is heat related leaf curl. If we had a photo of the entire plant and knew how it was growing maybe we could guess better. I see no spots on the leaves indicating disease, just the curl. I hope some tropical grower can help more.