Just a really quick post for anyone who wants to increase the Product Name length in Virtuemart.
Go to phpMyAdmin
Locate the table jos_vm_product
Find the field product_name (ot at the top of the table like you would expect!)
Then click change (the second button from the left)
Change Length/Values to the number of characters you want!
Save and job done!
Nice and easy but well worth doing if you are struggling with the standard 64 characters!