Programmatically Create MS CRM Account

Using CRM SDK4.0 you can customize CRM programmatically.
Download CRMSDK 4.0 from here
http://www.microsoft.com/downloads/en/confirmation.aspx?FamilyID=82e632a7-faf9-41e0-8ec1-a2662aae9dfb&displaylang=en
Then add web service reference in your project
Example: http://CrmApplicationUrl/MSCRMServices/2007/CrmService.asmx
Also you have to pass below Items in CRM Code.
- Organization Name
- Username, Password & Domain (CRM Credential)
See the below function code for CRM Account Creation.

public static void createAccount(string NewAccountName)
        {
            CrmSdk.CrmService myCrm = new CrmSdk.CrmService();
            myCrm.Url = "http://CrmApplicationUrl/MSCRMServices/2007/CrmService.asmx";

            CrmSdk.CrmAuthenticationToken myCrmToken = new CrmSdk.CrmAuthenticationToken();
            myCrmToken.AuthenticationType = 0;
            myCrmToken.OrganizationName = GetCrmOrganization();//"OrganizationName";

            myCrm.CrmAuthenticationTokenValue = myCrmToken;

            System.Net.NetworkCredential nc = new System.Net.NetworkCredential();
            nc.UserName = "Username";//Pass Username of CRM
            nc.Password = "Password";//Pass Password of above CRMAccount
            nc.Domain = "Domain";//Pass Domain name

            myCrm.Credentials = nc;
            CrmSdk.account newAccount = new CrmSdk.account();

            newAccount.name = NewAccountName;
            Guid newAccountId = myCrm.Create(newAccount);
        }

Happy coding !!!