Zoom We3G ($149 @
amazon).
Unlocked 3G. Using it with an iPod touch to make this post.
Just got it today but seems reasonably fast and has a nice set of features. Can accept a micro sd card and uses micro USB charger.
Small and light, perhaps a bit larger than my virgin mobile mifi.
Worked fine with my Blackberry's SIM (testing only - main use will be overseas with PAYG data sim cards).