Peek is a company with ideas -- but they like to tackle them one at a time. Last year, amid snickering and cries of uselessness from the gadget world, the tiny company launched an email-only handheld that's attempted to bring the idea of email on the go to the smartphone fearing crowd and we do know at least one avid user. Now the company has turned around and tried it again, this time with a seemingly even less essential device, the TwitterPeek. The TwitterPeek works in conjunction with Twitter, and only with Twitter. It's that simple. There's nothing else to figure out or set up, so presumably, the idea is that the device, like the