By scheduling tweets, you can stay in touch with your followers who may have differing time-zones. There are several services/apps available which allow you to schedule your tweets and consequently increase your traffic too

Here are two:

Stumble Upon Short URL Service (Su.pr) : You need a Stumble Upon account to use this service. It enables you to schedule tweets at a specified day (14 days in advance) and time.



Hootsuite : Enables users to send tweets to Twitter later at a specified day/time.

Su.pr - Drive More Traffic with Your Short URLs!

Welcome to HootSuite - The Professional Twitter Client

Know of any more better/easy one's? Pls share