I've spent a better part of a few hours looking into node_import + ubercard 2.x and have not had much luck importing correctly.  I'm hoping to get it worked out and blog about how to accomplish the heirarchical category import for products.

Here are a few issues I've been looking at:

• http://drupal.org/node/383926
• http://drupal.org/node/349408
• http://drupal.org/node/422322

When I find the solution, I will update this post.