Data Migration from MS Dynamics CRM 4.0 to MS Dynamics CRM 2011 ...

Dear Experts ;Wink

How we can import data [data migration ] from CRM 4.0 to CRM 2011 ? Do we have any Data Import Wizard [ Tool ] to Import data from 4.0 to 2011. If yes could you please provide me the url.

And also can we import data using CRM webservices?

Please give me you ideas and suggestions on this.

Thanks in Advance