Quick clarification: Entrust is now the #2 certificate vendor (behind the combined VeriSign/Thawte). You can buy certificates at Entrust.net.
Entrust doesn't resell Thawte certificates; it issues certificates that are chained to the Thawte root, but signed by the Entrust.net CA. In newer browsers (e.g. IE5) the Entrust.net root certificate is present so the Thawte root is not used. (Disclosure: I am an Entrust employee...)
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Quick clarification: Entrust is now the #2 certificate vendor (behind the combined VeriSign/Thawte). You can buy certificates at Entrust.net.
Entrust doesn't resell Thawte certificates; it issues certificates that are chained to the Thawte root, but signed by the Entrust.net CA. In newer browsers (e.g. IE5) the Entrust.net root certificate is present so the Thawte root is not used. (Disclosure: I am an Entrust employee...)