Not Updated For Current Season
This is my build for ashe though I change it up depending on whom I'm facing. I usually start with the vapiric seceptre then buy berserker greaves. After that I save to buy the b.f. sword and work it up to the bloodthirster. At this point you need to push for cash, so I do a combination of laneing and jungling. The golem buff really helps ashe push out valley and farm minions. Once I have the black cleaver I can do some serious damage. I get minion kills to stack it up then i push turrets and gank. I try to keep an eye out for the dragon since I can solo it at this point. afterwards it's a long push to the infinity edge. But once you have it the game should be just about ending, if not it will be! In some rare oncasions I have a game long enough to buy the dancer and the guardian angel. Which I buy first depends on how much I've been dieing. I might also switch out the boots for a second dancer at that point, but that's a really really long game. You can solo the baron at that point, though you shouldn't have to...
Some people prefer using crit damage runes instead of chance. I'll try it when I can afford them. I find that if I'm facing a team with more spell casters than melee I tend to go with a philosopher's stone and the mercury treads. Being slowed tends to be fatal with ashe's squishy physique. Many people will tell you to play mid with ashe, but the truth is she pairs very well with many champions. Especially Anivia, Mordekaiser, and Garen. With them pushing turrets is a breeze, and her ultimate attack combined with their's will gank just about anyone. She's great with Heimerdinger too, though you really shouldn't be in the same lanes.