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i think this is entirely stupid to have to make a more specific guide. no one plays any champ the same way so why should i have to tell you guys exactly how i play mine. i know almost none of u will play the way i do so there is no real reason to do this, what most people look at is just what runes, mastery tree, and what ability to max first, very rarely do they look at the strategy behind the items and what and when to do things. i think that the only type of champion that would require more information is a jungler sincethey are so essential to the game and there are specific routes that make things easier, and also when a good time to gank is. but for this champ who is always in lane except for the one guy that will go jungle will lane. if u do not know how to lane then u need to play more and figure it out on ur own.
i hope this was enough

well this is what i normally do with caitlyn when i go mid now if the other team has high magica then i well get banshees before everything and also get merc treds, i also sell my greves to buy third phantom dancer, last item is totally up for grabs though, wits end, frozen mallot, madreds, last whisperer, it will come down to basically what ever the other team is and alsop how u are playing.
also telepot, exhaust are not bad alternatives get wither ghost or flash in combination of the other 2, and i find the rest near pointless with my crit build, with caitlyns range, and passive i find this build to be highly beneficial.
Infinity edge, 2 phantom dancers, and vail is the core to this build but obviously if you are playing an all ad team then there is almost no reason to get vail and should proceed either to third phantom or frozen mallet
please feel free to comment.

most of the above is useless, this is what i have been building with her as of late, tell me what u think, new rune set up that i use for most of my carries, probably not the best but i wanted to try something new.

[UPDATED 8-13-11]