We have developed a Bulk Import Plugin with features:

1) Bulk Upload of Product, Categories, Manufacturers, Product Attributes.
2) Bulk Upload of pictures in Product.
3) Bulk Import of new categories, manufacturers, product attributes in product. Once new categories, manufacturers and product attributes are imported the products can be imported in bulk mapping with new categories and manufacturers etc.
4)User can upload 10,000 records in 120 minutes.


It's available here:

https://www.nopcommerce.com/p/3119/bulk-import-plugin.aspx