Look for a post by ursula (I think the thread was named "need for speed" or sumthin').
This particular post managed to get me speeds of up to 125kbps with a 1024k connection (I still can't figure what dudes like rkapsi here do to get it going at over 160...).
By adjusting a friend's LW for his 512k connection by following these same (although adjusted) steps, we managed to get speeds of up to 65-70kbps (hehe, he's still too slow for me; eat my electronic dust dude!).

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-