I want to schedule my tweets. Which is the best and easy service to do that?
ManageFlitter and Futuretweets both are good. You can try any one of them.
Futuretweets is the best. Its simple and also free.
Hootsuite is a pretty good option which you can try.
I would like to suggest Twuffer. Twuffer is one of the easiest tool available for scheduling of Tweets. and another one TweetDeck.