According to the NETGEAR website it would appear that the major difference is speed.
B sits at 270Mbs, T at 300Mbs. They are also ideal for different machines.
http://www.netgear.co.uk/rangemax_wirelesscard_laptop.php
http://www.netgear.co.uk/pdfs/WN511B_DS.pdf
http://www.netgear.co.uk/pdfs/WN511T_DS.pdf
Good luck.
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