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I've never read a more clear article than this on why to prune or not prune
  http://www.finegardening.com/how-to/articles/pruning-tomatoes.aspx
This year I'll try clipping off the tip 30 days prior to last frost to ripen the last trusses faster.

Very informative, thanks for that! ;D

"The intrinsic vigor and hardiness of tomatoes almost always guarantees a successful harvest."

after the first line I couldn't go on  :D