fraser_john,
you can use armaflex pipe insulation to solve this problem, choose your inside diameter based on the number of beer/glycol lines, wall thickness of 25mm should be fine, i have a run of 4 metres from fridge to font carrying 4 beer lines and 2 glycol lines and i dont get any condensation
wrap glad wrap around the beer lines before passing through the armaflex, then use some lube to help get it through, make sure you tell your wife what the lube is for so she doesnt start thinking the wrong things when you have your friends over 
run some silicone between the joints of armaflex and then some pvc tape after the silicone cures
also consider catching the condensation from the base of the font, if you have a flooded font, it will condense, so your drip tray needs to go all the way to the base of the font, not just under the taps
another thing to note is that you may get some condensation underneath where the base of the font pierces through the benchtop, run the armaflex all the way over the threaded section of the font base and then spray some expandable foam around where it meets the underside of the bench, this helps insulate the cold from transferring through the bench
