Ultra slow wifi

After months of not being able to connect to my wifi router (3COM) (kept getting 'Error connecting to network') Apple told me problem lies in my router and I should get a compatible router... like theirs... (disgusting - every other brand of wifi adapter has managed to connect to it)
Anyways, so I read almost every post on this forum and bought a Linksys WAG354 as it seemed most people could use it with no problems. And hey presto I can connect to it!!
... but my speed is ULTRA slow. I'm copying 30Gb to a PC wired to the router and my transmit speed (As monitored by MenuMeters) is occasionally going upto 1.5MB then down to 200KB, but usually hangs around around 500KB!! (~4Mb) and I'm sitting just 2m from the router with apparently full signal strength (5 bars according to the icon).
My router is set to 11g and other wireless PCs which are about 15m away in another room can copy at about 20Mb. When I try the same copy except with MBP wired to the router MenuMeters reports around 90Mb - so no problems there.
Basically my wifi is ultra slow. Does anyone know why this could be? Any hacks/patches I could apply? I do software update everyday, so I guess its a 3rd party fix I need - or maybe something to do with the router config? channel? wpa etc?
MacBook Pro C2D 17"   Mac OS X (10.4.8)   Week 46 Build

this is a known bug of the C2D wifi cards, it's still not clear what causes it, but i looks like a software problem, hopefully, otherwise the wifi card has to be replaced....
your not the only one waiting for a new update for the airport extreme drivers in the C2D and the mac pro.

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