Both my DC's are on a 2003 standard and 2008 standard edition. Is there a way to wirelessly authenticate to the network without a CA. Like using a 3rd party authentication.

Yes you can. You can use use any of 802.11 authentications like 1. Open 2. WEP 3. WPA-TKIP 4.WPA2-TKIP/AES They dont need any cert and works on pre shared key basis. You need to configure the Pre Shared key on the ACess point and share that with the users http://technet.microsoft.com/en-us/library/bb457016.aspx