I am currently working on a small ASP.NET app that will be using DataObjects.NET. 

See: http://www.x-tensive.com/Products/DataObjects.NET/

I don't forsee any problems, but do have a few "unknowns" to figure out still:

• How are the automatic DB Schema updates going to work? 
• Will I have to update the DB by hand, if the automatic aren't allowed?

I have stayed away from this product until now because I didn't know the answer to these questions.  I will be posting my end results in this thread once I have the tested this and/or uploaded my app.

Has anyone else used DataObjects.NET?  On ultima?  On other shared host environments?

Not sure about that product specifically, but our ORM / DAL solution "Diamond Binding" works fine on the Ultima shared hosting packages (it only requires Full Trust).

 http://dunnchurchill.com/products/diamondbinding/Default.aspx