Like the title says! If you want to have a kickass costume next year now is a great time to get started...
AngelsBoutique has the most amazingly well made costumes I've seen on Etsy. Srsly.
UpfromtheAshes is affiliated with THE Amy Brown! She has wings, tiaras, masks and jewelry.
ViolentBelle has beautifully detailed head wear including cute devil horns. You can build an entire costume around one of her pieces.
rockinbonesclothing: perfect for those who are too old to dress up but not too old to look hot on Halloween!
babypop has cute super hero costumes for kids AND adults. Also takes custom orders!
Don't have an Ety account? Sign up for free here!
Halloween Online: pumpkin carving stencils, decorating ideas, costumes...I LOVE the recipe section.
Halloween Magazine : basically a one stop link listing to everything you would need to make your Halloween it's Halloweeniest.
Halloween on the Web: find haunted houses, costumes, pumpkins, crafts, monsters, party information and more. Also has forums!
History of Halloween: totally cool site. Everything you've always wanted to know about Halloween. Has video as well.
Have any cool links to share?