Hmm, sorry...
I thought my Googling had found what you had asked for but it turned out it has to be docked...
http://www.g4tv.com/techtvvault/features/40497/Review_Logitech_io_Personal_Digital_Pen.html?article_key=40497
Is there such a thing as Bluetooth - or other wireless technology - pen that will allow me to write on paper yet capture what I write, digitally? This would be a great way to take notes if, say, you only have a phone with you, not a laptop, and you can write more quickly than you can type.
Transfer to/from the host PC isn't wireless I don't think, but the Logitech IO is essentially a "normal" pen (no wire) that digitally captures your writing (on special stationery) which can then be transferred via the recharge/docking station.
Logitech have since sold the IO product to Destiny Wireless (UK).
http://www.destinyplcshop.com/acatalog/notetaking-solutions.html
My wife got one of these after it appeared on the Gadget Show, you just clip the reader to a pad or any peice of paper and write away. To access your notes you just plug it in via usb and either save as a .jpg or convert to text in word.
http://www.bmcdigital.co.uk/catalog/browse/zpen/daneelec-digital-zpen-light-with-1gb-memory
Hmmm... from the looks of the pack from Destiny Wireless it seems that the Logitech IO included is the dockable one, not the wireless model (there are 2 separate versions).
Another company in the UK offering digital pen solutions is Magicomm. It seems that their G303 pen is both dockable in a USB cradle, but can also communicate via bluetooth with your phone.
They have a consumer site that seems to offer the same sort of things as the Destiny Wireless one:
http://www.originote.com