When using $_SESSION to "store parameters", rather than $_GET be aware that people may open the same "window" in different tabs (Firefox... IE7?). When the $_SESSION variable stores an "id", changes to an earlier tab may be incorrectly stored (uses the latest id).
Just thought I'd mention this as I have come across a couple of sites where they do not take it into account.
Potential problem - Sessions and FireFox Tabs
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