OK, newbie here...

I have a business trip planned to China in late April 2008.

I then go on vacation (cruise) in late May 2008 to Greece, Turkey, Israel, Egypt, & Italy. In that order...

I have heard that there are issues with entry to certain countries when a stamp/visa is present in the passport from a previous country visited. Do I have anything to worry about with the above countries?

Also, can anyone recommend a China visa service here on the west coast USA? Any tips?

PS: lots of pages left in my passport that expires June 2009.