The iPhone will no doubt see it's fair share of Twitter clients (just as the Mac has). Twitterrific is the big name in the Mac/iPhone Twitter app space, but in a client from Tapulous called "Twinkle" has also been generating some interest. Originally released as a jailbreak application for the iPhone and iPod touch, Twinkle has just debuted on the App Store with the ability to location-base your tweets.
While Twitterrific seems to have more precise locating abilities, Twinkle uses the location-based tweeting in interesting ways. For instance, you can see tweets originating within a certain mileage range from your location. Twinkle allows you to easily view your direct messages.
Overall, Twinkle looks like it will give Twitterrific a run for its money. Best part of all? Twinkle (iTunes Link) for iPhone and iPod touch is absolutely free.
Check out our gallery for some screenshots.