I too love toms and grew a load in my polytunnel last year just to loose most of them to an attack of caterpillars which I have never seen before I have found this top 10 growing tips that is quite useful.

http://gardening.about.com/od/growingtips/tp/Tomato_Tips.htm

Some varieties will obviously produce more than other but a couple of general tips-

Gently tap the stems of the plant and mist them with a spray bottle.

Seems to produce more for me.

Conversely some gardeners do not feed tomatoes believing that though the yield is lower the toms have greater flavour.

Personally I do feed them-both tomorite and home made seaweed/nettle drink.

Thank you very much for your tips, much appreciated.