Disclaimer: If you try this, you can't make me responsible if you managed to screw up your system.
For work I got a Lenovo T400s notebook, 2808-D9G to name the exact type. One thing that bugged me was the lack of an ExpressCard slot, but today, while taking out my keyboard for cleaning, I discovered that there is a way to remove the card reader, and guess what's behind it? Yep, an ExpressCard slot...
So here's a small guide on how to remove the card reader and get access to the ExpressCard slot:
1. Remove the battery and the marked screw which holds the coverplate of the RAM:
2. Remove the two screws marked on the picture with the keyboard-symbol next to them:
3. Remove the keyboard (and take care of the cable connecting the keyboard!) and remove the marked screw:
4. Push in the card reader and you will see that a regular ExpressCard pops out:
5. Reassemble your notebook, but don't put back in the screw that holds the card reader. You now have a T400s with an ExpressCard slot:
It seems like I'm not the only one who discovered that, here's a Forumthread about that, but the pictures don't work.