ALWAYS ask for Linux stuff when visiting the store, and even buy (spend money even) packaged copies of Linux stuff especially the newest edition of the software from the store, keeps them restocking and helps out the Linux companies, doesn't set me back much $$$ either. IF I already have that software or don't actually want it I "Donate" it to a worthy cause (read someone who might actually use it)
4.) when browsing in the computer stores ALWAYS ask if this printer or that modem works with linux..sure you know the answer but maybe it will encourage these shelf jockeys to find out what linux is.
5.) Comp USA used to advertise "we install any software purchased here" well I bought a copy of Red Hat there and asked them to install it....duh, almost felt sorry for the poor guy behind the counter. I said almost.
6.) always ask for stuff that is linux specific, I always check on the
latest edition of Linux magazine (and Journal), ask if you don't see it on
the shelf.