I have not tried any of these but skimming through the articles they look very useful! Use any import information at your own risk!
The blog is located at http://ax2012exceldataimport.blogspot.com/, and currently has the following articles:
Generic Data Import Information and Setup Walkthrough
Import Customers
Importing Vendors
Importing Main Accounts
Importing Products
Importing Customer Transactions/Balances
Importing Vendor Transactions/Balances
Importing Ledger Transactions/Balances
Importing Inventory Transactions/Balances
Importing Sales Orders
Importing Free Text Invoices
Importing Purchase Orders

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