Elana,
I took zoloft for a while and didn't give up coffee either. But, I've heard people say to use caution when combining caffeine and psych meds, in part because the crash in mood and energy that inevitably follows the cup of coffee can be really hard on people with depression. Also, caffeine tends to increase symptoms of anxiety and complicate sleep issues.
I'm not planning to give up my morning coffee anytime soon... I'm not having any ill effects that I'm aware of, and it really isn't my top priority. But I have heard from a number of sources (nutritionist, therapist, books on mood management) to use caution in this area.

garden gal