Creating a link to new document infoPath form in SharePoint 2010

If you want to create a hyperlink to the new document button of a forms library then you can use the following template.

http://{server}/_layouts/FormServer.aspx?xsnLocation=http://{fullpath to the library}/forms/template.xsn?DefaultItemOpen=1

Just change the server (incl. site collection) and the full path to the library.

That should do it!