Here's the 8/03/06 State Department consular guide for Turkey:
http://travel.state.gov/travel/cis_pa_tw/cis/cis_1046.html
Given the state of anti-American sentiment in Muslim countries these days, I'm not sure that I'd go anytime in the immediate future.
SAFETY AND SECURITY: Terrorist bombings -- some with significant numbers of casualties -- over the past four years have struck religious, government, government-owned, political, tourist and business targets in a variety of locations in Turkey. The possibility of terrorist attacks, both transnational and indigenous, remains high.
I think I'll pick another place. I hear Cleveland's lovely this time of year.