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People will visit your site via the search engines..not from playing around in their browser address guessing what your website might be called .
Global Extensions including .Net , .Info . .Biz , .Org , .WS , .Travel , .Jobs etc..(actually a cctld but se's treat it as a GTLD)
ccTLDS use to reach specific country markets
However, there are other extensions which can fit your business model. For example, .orgs are a great extension if you're working with non-profits or public entities. (But the margin is smaller if you're simply a domainer.)
Also, many of the other, newer extensions are starting to make their marks and those premium domain names are now selling in the four- and five-figure range. For example, .de (Germany) is now the second most popular extension behind .com. .co.uk is another. And .us is becoming more and more popular (and more expensive in the premium domain circles) as the quality .com names are long gone.
Again, it depends upon what you want to do with the domain. widgets.com would be preferred, but no longer the only - or always the best - option.