Infopath form and Workflows

Workflow Examples with video and also downloading tutorials:
http://rshelton.com/archive/2007/10/05/free-workshop-sharepoint-document-workflow-for-developers---part-1.aspx


Send Email with Infopath Form :

http://www.bizsupportonline.net/browserforms/send-email-infopath-browser-form-sharepoint.htm


Simple SharePoint Workflow with InfoPath Task Form Example :
I’ll be using the following tools here:

• InfoPath 2007
• Visual Studio 2008 (with VSeWSS 1.3 installed)

My aim is to describe the following theory:

1. Publishing the form in InfoPath
2. How to reference the form in your workflow
3. Sending data to the form
4. Receiving data from the form

for more details click on this link:
http://sharepointgear.wordpress.com/2009/03/22/simple-sharepoint-workflow-with-infopath-task-form/

The best blog link for study the infopath form is:
http://blogs.msdn.com/infopath/archive/2007/02/26/passing-data-into-a-form-input-parameters.aspx