Here are my favorites in no particular order:

http://www.warehousefabricsinc.com/

www.housefabric.com

www.fabricguru.com

http://www.kaboodle.com/muchado/decorator-fabric-resources.html

Here are some of my favorites for decorator fabric deals:

http://warehousefabricsinc.com/
http://www.fashionfabricsclub.com/
http://www.discountfabricsusacorp.com/
http://fabrics.com/

http://www.designdivafabrics.com/special-offer.php

I love design diva fabrics. I've spent...e gads too much, but I always get great fabrics on huge discount sales. The quality is unmatched from any cheap fabric store I've visited or ordered from.

I'm about to enroll in a twelve-step program to help wean me off this site: Sanderson Fabrics.

Caveat: you do have to pay customs, so factor that in. The quality of the fabrics is exceptional and the customer service is only so-so ... but I keep going back for those fabrics!

Try denverfabrics.com. When I lived in Denver, I loved just going in and looking.

Thankyou all......I have checked out every site suggested, and now I am in even more trouble than before ;)
Seriously, these sites have beautiful ideas.

Thanks for posting those sites! I have been looking for online fabric stores myself.