If you are looking for a mini sized Wi-Fi router, the new Asus WL-330NUL would be worth looking into. The Pocket Sized router is also equipped with a fold away USB connection.
The Asus WL-330NUL Pocket Wi-Fi Router is just larger than a USB flash drive and is equipped with an Ethernet port on the one side and a USB Cable on the other and weighs just 25g. This device is perfect for people who travel a lot.
“The ASUS WL-330NUL Pocket Router is the world’s smallest fully featured wireless router designed to make getting online via Wi-Fi as easy as possible when away from a home or office network. Barely larger than a USB flash drive and weighing just 25g, the WL-330NUL Pocket Router features a single Ethernet port for connection to a wired network and built-in 802.11b/g/n Wi-Fi for extending a wireless network.”
“ Powered from a notebook USB port or by plugging directly into a mains socket, the WL-330NUL Pocket Router creates its own secure wireless hotspot for easy sharing of a wired or wireless connection with multiple wireless devices. The WL-330NUL Pocket Router can also be used as a USB Ethernet adapter for notebooks that lack a built-in Ethernet port, making it the perfect travelling companion for ultra-slim Ultrabooks”
Unfortunately, Asus hasn’t yet announced the release date or price for the Pocket Router.