Hi,
You can modify the BizForm web part (~\CMSWebParts\BizForms\bizform.ascx) according your needs. So, you can add some kind of label control to it and in code behind of this web part you can pull the BizForm data (records) from database using BizForm API:
http://devnet.kentico.com/docs/devguide/bizforms_api.htmThere is “Updating a record” section where you can easily see how to get DataSet object of all BizForm data. Then you can simply count DataSet object records and display resulting number in some label control.
Best Regards,
Miroslav Remias