I have two laptops both running Windows 7 with IE 8 and it seems with the last two updates to NIS2010 have been causing an issue in IE 8 where typing in the browser has a "delay". Once I disable the "Symantec NCO BHO" (which disables the "Symantec Intrusion Prevention") plug-in the "delay" issue disappears. If I re-enable the plug-ins again the issue comes back.
<<Edit: Subject and message edited to clarify the product version>>