I'm a trader and so system stability is crucial for my business, which is why I am still on xp 64-bit and have not yet upgraded to windows 7 due to potential incompatibility issues with my trading software. I'm sure there are many other customers who purchased a product using the displaylink drivers and are disappointed that XP x64 is not supported. There are other solutions, such as the StarTech USB to VGA Multi Monitor External Video Adapter which supports windows xp 64-bit. it's about $50
http://www.newegg.com/Product/Produc...ECH-_-15158162
It would be nice for displaylinks to spend just a couple of hours to release a 64-bit driver on the forum so those of us who have already spent the money for a displaylink driven product can USE IT.