You could bookmark this too -- insurance rates (both (a) regular insurance and (b) insurance with registered mail):
http://new.usps.com/cgi-bin/uspsbv/scripts/content.jsp?B=Mail_or_Ship&D=9743#insured

Note: if the value is high, say $1000 or more, the entire cost is much cheaper sending the parcel via registered mail. It is worth the trouble of the special packaging requirements of registered mail.

Robt.