Sharp announced the Willcom D4, which was the first Intel Atom based MID in April.
Features of the Sharp Willcom D4 include 5 inch TFT screen, Intel Atom Z520 processor at 1.33GHz, 1GB RAM, 40GB HDD, Wifi, QWERTY keyboard, Bluetooth, micro-sd card, WANSEGU Digital TV Tuner and 2MP camera.

Pocketables got their hands on an imported Sharp WS016SH device and published a review.
Quote from the review: "The Willcom D4 (Sharp WS016SH) UMPC is currently the smallest-screened Centrino Atom device running Windows Vista in the world. Launched alongside the Kohjinsha SC3 on July 11th in Japan, the 40GB slide-and-tilt handheld computer is an unlikely candidate to see an official release outside of Asia, but that doesn't mean it can't make it to American soil. With the help of an importer like Conics.net, anything is possible.
The UMPC is available now for import from Japan for between $1,200 and $1,500."
Read the full review on Pocketables. GeekStuff4U is for instance offering the WillCom D4.