SPF Record Testing Tools

http://www.kitterman.com/spf/validate.html

openspf
http://www.openspf.org/Why
http://old.openspf.org/wizard.html

microsoft tool
http://www.microsoft.com/mscorp/safety/content/technologies/senderid/wizard/default.aspx

http://www.vamsoft.com/spfvalidator.asp
http://www.vamsoft.com/spfcheck.asp