I was reporting few days ago about an eBay seller that is offering 2 Gb of memory for Fujitsu P1610/20 at $129, that's 70% less than the price at Fujitsu’s Website. I ordered one and I received it Today. It's working! My P1610 is now more responsive and I see a lot less HDD activity going on.
Summarizing: A recommended eBay Seller and a recommended upgrade for all P1610/20 owners.