I challenge anyone to deny that Gmail's contact management UI is absolutely dreadful.
We ought to be able to post any one of several valid collections of names and email addresses into a text box and have Gmail chew them up and generate contacts.
Instead we have to craft a .CSV file to load contacts -- and there's NO process for uploading a group membership list.
The secret to the .CSV file, btw, is to fill out the fields on a Gmail contact, then add it to a new list, then export the list as CSV. That's now the template for your imports.
In my case I made a mistake on my first data load. I loaded all my list members -- but with NULL email addresses. The corrected upload was rejected because the names already existed.
Microsoft, lately, does much better web work than this. Heck, the original Gmail contact management/group management UI was far better than the current mess.
Only Yahoo! functions at this level.
Yahoo! must have build Gmail's contact and group management UI.