You should try a bigger display.
Being able to display two documents side by side is invaluable. A small display might be fine for a novelist, but anyone who does research and works from sources can benefit from a big screen.
Those great academics you are referring to all had case books and journals sitting open next to their typewriters. I, for one, no longer use books for any sort of research, everything is on my computer.
The 1440x900 display on the 13" MBA barely allows me to be productive, the 1280x800 display on the MBP is just not good enough. Whenever I need to get any real work done I use my 1920x1080 desktop(and I wish I could afford the 2560x1440 iMac display).