Answer for your questions:
>>I'm making an ecom-solution where i need to print out the names of variant-groups in the productlist. Is that possible?
Yes, it’s possible with ProductListTemplateExtender.
>>As far as i can see, it is only possible to get the name of group-variants in the single-product-view. Is that correct?
Base functionality works this way, but you can extend it with template extenders and notification subscribers. Ecom contains a lot of them.
Related thread: http://engage.dynamicweb-cms.com/Forum-5.aspx?PID=34&action=ShowThread&ThreadID=2407
Information about ProductTemplateExtender you can read here: http://engage.dynamicweb-cms.com/Admin/Public/Download.aspx?File=Files%2fFiler%2fDocumentation%2fDevelopment%2feCommerce%2f(en-US)+eCommerce+Extensibility+API%2c++Dynamicweb+eCommerce.pdf)
A lot of information you can find here: http://volpav.wordpress.com/resources/
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