Soaring Safety Foundation.
Educational programs focused on Safety issues. Please be sure to take the time to review their resources.
Motorglider / Self launch based sites.
Discussion on a variety of topics plus some sales notices.
Wings and Wheels.
Listing new and used Equipement, new Ships. Probably the most active site listing sailplanes for sale.
Thirty Tousand Feet.
Why re-invent the wheel? Here is a link that will get you just about anywhere in the soaring community.