I've just posted my complete review on the latest ZIP driver from Iomega, the ZIP 250 USB Host Powered that doesn't require a power adapter anymore! So if you're on the look for a portable ZIP drive, be sure to read the review. Here is a snippet from it:

Tired of all 1.44 MB floppies on which you can’t store your MP3s, documents, videos and other huge things? If so you surely have to buy a ZIP 250 drive! The disks used by this drive can contain the equivalent of 170 traditional floppies! Since the introduction of ZIP drives in 1996, Iomega has sold millions of products around the world and its ZIP format has became a kind of standard used by computer professionals as well as home users. Unlike the LS120 drives or the ghostly Sony HiFDD 200 MB drive, a ZIP 250 drive is already bundled with many computers: one more proof of its standardization. Iomega has recently added a new model to is line of ZIP 250 drives: the ZIP 250 USB Host Powered. This new ZIP drive that uses USB connection is slightly faster than the old parallel port model, and is intended to all of you who need to transfer, store or exchange files on the run, while using those large capacity ZIP disks of 250 MB. The main new feature of this model is that it doesn’t need any AC-Adapter! Here is our review of this great addition for every PC.