I still use an X60 Tablet for travel, mostly as a terminal for the machines at home. Original CPU is good enough for VNC+Wireguard. AFAIK, there aren't any CPU/MB upgrades for X60/61 Tablet. I still like it because of the 4:3 screen.

I upgraded the screen to the 1400x1050 with a new display panel from china, but I had to cut the front screen protector and remove the "oil". It seems a little bit darker without that liquid inside and dust particles entered in that space. I couldn't find any LCD upgrade for the CCFL lamp at that time and now I'm not sure it's worth the effort.

I'd love to see a working coreboot for X60/61 Tablets that can still boot DOS and WinXP.