I think it was the March issue of Martha Stewart Living that did a piece on 'paste' tomatoes - Roma being one of these.

Paste tomatoes are best for use in making paste (obviously) and sun/oven-dried, due to them having less watery pulp.

I'm growing some Roma to experiment with this year. Although last year i oven-dried some Moneymaker and some other type with success and they're in a jar in the fridge covered in oil. Although the oil has now solidified so not sure what state they're in at present!