Several customers have asked for a bulk search page. On the page, you can enter up to 100 domains to search for at one time. We are in the process of adding this page to our system.
When I investigate names I like to check different extensions, at least the more popular.
So for me is better a system where you write names first and then select extensions. Writing domain.com, domain.net, domain.org, domain.biz... is repetitive. Bear in mind with my method if you enter 100 names you actually will be checking 100xExtensionYouChoose
BTW, I'd prefer you have the possibility to enter names one name per line or seperate with a space or comma. The more versatile a tool, the better.
At results pages I'd display results only, not form box again and then results. The way http://www.domaintools.com/bulk-check/ works is good for me.
File upload would be useful for me. Also file download results.
But I'm the only one asking for these features so... :/