Spot Cool Stuff is fascinated by the ever expanding functionality companies are bringing to Twitter. Some hotels offer concierge services via Twitter. Some take-out restaurants allow customers to place orders via Twitter. And now at least one VoIP company, Jajah, is launching a service that places telephone calls via Twitter.

Here’s how Jajah’s Twitter calling works:

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The explosion in the popularity of Twitter has brought with it an explosion in the selection of Twitter-related websites and application. Here’s a rundown of a few of our favorites, with the ones we especially liked are in bold. For this list, we decided to only include websites that were free (though a few involve a download that costs money). We also excluded sites that are in the early phases of beta testing.

Is there a Twitterish site you think should be on this list? Let us know in a comment, below. And, of course, make sure you follow Spot Cool Stuff on your Twitter account . . .

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