IE8 will ignore your session cookies under some or all of the following circumstances:
- the privacy settings have been adjusted, or left as default
- the cookie is in a redirect
- you are redirecting with a 302 rather than a 303 (possible red herring)
- you haven't sent a magic incantation header of the form:
"P3P","CP=\"IDC DSP COR ADM DEVi TAIi PSA
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