Here are some pictures and a brief explanation from installing the extra memory and Intel 310 mSATA SSD install in my Lenovo W520.
Pretty self explanatory, there are two Phillips screws that need to be taken out of the center panel on the bottom of the laptop.
I moved the existing 2 GB SODIMM to the second slot on the bottom and inserted the new one in its place. To get at the mSATA slot the keyboard needs to come out which involves two more screws.
This one was a little trickier. Basically the entire keyboard needs to slide backwards until the front of it can lift up and out of the laptop. I used the memory kit packaging in the slot in front of the space bar but others have reported credit cards work as well. I probably wouldn't use something like a screw driver as the pressure would be concentrated on to small of a surface.
Easiest step for last. There spot where the SSD goes is covered by a black plastic case. Pull it out, reroute the Cell and GPS antennas, and then undo the single screw needed to hold the drive down. It slides in similar to a SODIMM and then needs to be screwed down. At this point you also want to put in the other new memory module. The existing one needs to be removed to get at the secondary slot as it is underneath the primary one.
Now reverse the procedure and put it all back together. I hope to post information on the actual Windows 7 install and the configuration within the next week or so.