The Cruzer 4gb is a small retractable usb memory stick. It is built out of lightweight plastic and has a small keyring to attach it to bags, keys etc. Being retractable means that there is no cap to loose and that there is never any chance of the connector being damaged in you pocket. It doesn't feel chunky or too heavy, and is perfect if you need to ferry files across computers or carry important documents with you all the time.
Not only is it extremely portable but being 4gb in size, it easily stores enough for everyday use. The read/write speeds are fast, and the pre-installed U3 software makes carrying around your favorite programs and files easy. In fact it allowed me to carry a whole office suite and my favourite internet browser with all my bookmarks and settings in my pocket. This could be very useful for someone who is continually using different computers and doesnt have the option to install software on them.
I find this memory stick an absolute essential in my every day work, and I think that this is probably one of the best you can get. The bundled software and the option to expand on it, makes this something I cannot live without.