The Webplayer has one sodimm slot, the other slot that some folks claim was the second memory slot is a type III mini-pci slot.
There were many eBay auctions some time ago that listed the specs stating this and created some confusion.
As far as total memory goes, I am not sure what the max is, I have used a 128mb, there is a 16 chip 256mb sodimm at Circuit city that I bought for my GCT that might work, Nothing else you can always take it back if it doesn't.
