Though the next-gen 802.11N wireless standard technically hasnt even been finished yet, somehow D-Link are in a position to claim they're the first to release a device compatible with 802.11N, this being an ExpressCard based network adapter for notebooks.
Reg Hardware posted up some brief details on it here.
D-Link has begun shipping one of the first pre-standard 802.11n wireless networking adaptors that will slip into a notebook's ExpressCard slot.
The Xtreme N-branded DWA-643 is an ExpressCard 34 device so it should also fit into laptops with ExpressCard 54 bays. Alas, the the device only operates with Windows, so MacBook Pro owners who don't possess a Core 2 Duo-based model remain out in the cold as far as next-gen Wi-Fi goes.