Kishel's Doe Passion. I have used it for three years and always have bucks come in to it sniffing. It's not a synthetic and if I have some left I can cap it and store it until the next season (in my beer fridge in the garage). I also use their Buck Thrasher II which is an all-season gland and musk lure.
Also check out eBay, there's a guy selling scent canisters that use a wick, can hang or stick in the ground, and have an o-ring seal to keep the scent from evaporating between hunts. I just bought three sets (of three: red, yellow and green) for $15 and I can't wait to try them out!

www.kishelscents.com