I4U News published a report on upgrading the classic IBM Thinkpad X40 with the new KingSpec SSD that works as drop-in replacement of the noisy and slow 20GB 1.8 inch HDD.
"There have been solutions for a while that required you to do some soldering or buy a PATA adapter that works in conjunction with ZIF type 1.8 inch SSD. I am just not into soldering at all. Now a Chinese company called KingSpec is offering drop-in replacement SSD for the IBM Thinkpad X40, X41, and X41T.
The upgrade is definitely highly recommendable as your are getting basically a top of the line netbook with still one of the best mobile keyboards around.
It is kind of funny to have a 5 year old hardware that can compete with brand new netbooks in terms of size, speed and ergonomics."