An update: following the original posting relating to the release of the 4.01.37 firmware for the Netgear DG834v3 and DG834Gv3 in the spring of 2008.
The more recent v4.01.40 was released in the autumn of 2008. Either the .37 or .40 (I'm forget which now) or both contain important bugfixes and enhancements that resolve various router software bugs and omissions which adversely affected Vista with its new high-performance TCP/IP subsystem. Unfortunately this doesn't seem to have been written up in the release notes as fully as might be wished.
Anyway the latest release should certainly be considered a must.
Make sure to test using the Microsoft Router test tool "Internet Connectivity Evaluation Tool", found at
http://www.microsoft.com/windows/using/tools/igd/default.mspxNot: best run on Vista for fullest range of tests, must be run as administrator, will need to set vista window scaling back to "normal" for a proper test as described in kitz' article below. Only run over wired connection, not wireless as this can cover up some faults.
Further reading -
http://www.kitz.co.uk/adsl/vistaTCPtweaks.htm and its associated references.