Lemon scented furniture polish is supposed to be a deterrent - a few years back we would get 5-6 every day on our sitting room curtains (and I'm not talking small ones - the ones with big long legs) - I'm absolutely petrified of them, always have been. I bought some lemon scented furniture polish (after some searching on the internet) and sprayed it around the skirting boards - haven't seen any since :p
They also say conkers in windowsill and door frame corners deter them as they hate the smell...; do you think ive ever been able to find a blinking conker anywhere? (ebay sell them though when they are in season)
Sorry to dissapoint but the conkers thing is an old wive's tale and does not keep spiders at bay. I've got a sort of restraining order system for spiders in my flat, so long as they keep to the ceiling they can stay, come near and it's out the window. I like the chicken idea, at my mum's house the chickens occasionally wander in if the door is open but my dog takes great delight in fulfilling her 'duty' of chasing them back out again so they don't get a chance for spider hunting. The cat likes the big house spiders though but I'm not sure if it's worse having spiders around or seeing the cat with spider legs hanging out it's mouth. :{
Sorry to dissapoint but the conkers thing is an old wive's tale and does not keep spiders at bay.