Salesforce. I have a list of accounts and contacts in Salesforce.com.
I want to create a campaign of contacts (Nt leads) and schedule calls
for them all at once. Can I o that and if not any ways around it ?

There's no way to do this within the application itself automatically.
You should check out the excel connector though at:
http://www.crmsuccess.com/browse/feature_detail.jsp?id=00630000002mUplAAE

This will let you pull down a list of contacts and create tasks
against them all completely within excel. It definitely isn't
straightforward but this is really the only way to do it today without
writing some custom code.

For more help with this, you might want to post your question on the
CRM Success forum at http://www.crmsuccess.com/connect/

Enjoy,
-Jager