On the recommendation of Cris I bought a Thomson Speedtouch 546 to replace my Netgear DG854G and can't recommend it enough. At its worst my Netgear was dropping carrier several times a day and usually needing a restart every week. The Thomson runs for months on end and I also gained a whole meg in downstream speed. The Netgear has been relegated to AP duties until I get a around to playing with 802.11n.
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Cheers,

Andy M