To create a forms library definition with VSeWSS 1.1 is very easy.  You can similarly create a list definition based on a content type.  However, you cant automatically create a forms library with an attached content type.

This is how I did it.

1. Create your content type
2. Create a temporary list based on the content type
3. Create a form library list
4. Edit the forms lib schema.xml
1. Copy the content type fields from the temporary list schema to the <Fields> node.
2. Update the <List> node, adding:
   
   

3. BaseType="1"
   Direction="0"
   EnableContentTypes="TRUE"

4. In <ContentTypes> optionally remove the base Form content type reference if you only want to allow the specific content type:

   <ContentTypeRef ID="0x010101"> ... </ContentTypeRef>

5. Add a new <ContentTypeRef> that has the ID that matches the content type you created in step 1.

5. Delete the temporary list definition
6. Deploy and cheer!