If you try to view transactions in the Shop (Transaction.pm),the results won't render in internet explorer 6.0, it is likely due to the new ajaxing that has been added.
The results will render fine in Mozilla firefox 3.0.4 (only one i can test with atm).
I dont know what the statistics for browseruse is, how many use ie6 these days? Is it a big problem? You decide ;D