Sekai Project has open their CLANNAD Official English release kickstarter today. The project's goal is $140,000.
Update: The $320,000 Stretch Goal has been reached. The "Hikari Mimamoru Sakamichi de" Side stories will also be localized. If you want the side stories, simply just manage your pledge and add either an additional $25 for the digital, or $30 for the physical copies.
If you're curious about CLANNAD, check out Rockmandash12's review.