+1 on Bartley's, +1 on avoiding Andover and J Press, -1 on Elephant Walk, +1 on Drinkwaters, +1 on Stel's, -1 on Louis, +1 on Hong Kong sucking, +1 on Temple Bar (was just there tonight), +10 on Pho Pasteur - great food and service is very friendly/courteous, +1 on Grendel's, too many bums in Central, but I love it.
Anna's/Felipes

- very cheap Mexican. Boca Grande between Harvard and Porter is my current favorite though.
Henrietta's Table (in Charles Hotel, might also try to catch a show at the Regatta Bar - great jazz there sometimes) is interesting for locally farmed fare.
Harvard Sq theater usually has interesting movies; so does Kendall.
If you plan to spend most of your time in Harvard Square, I would avoid driving. There's construction all through it now in what was a nightmare drive to begin with.