Dell's XPS M1330 seems to be getting better and better with every passing week. As if Dell adding it to the list of systems it has available with Linux pre-installed, it has now become the company's first system to offer a built-in Wireless USB module - which given the undeniable (and unsurprising) popularity of the M1330 is a great move.
As well as the internal module, Dell is also bundling a four-port WUSB hub from Belkin, which is obviously going to be necessary if you want to actually use it. Specs wise you'll still find the same 10m range limit, support for all USB 1.0, 1.1 and 2.0 devices and the requirement to install device drivers - it isn't a magic hub.
Alas this is currently only showing on the US dell site, but as Belkin's WUSB hub recently saw a UK release, and Dell is usually pretty good at adding these new options simultaneously worldwide we have high hopes for us Brits getting the option soon too. In terms of pricing Dell has a pretty compelling deal too; while the Belkin hub is around $199 separately, with the XPS M1330 it's a mere $150. Assuming that difference holds true in the UK, we'd expect it to be roughly a £100 option - hardly cheap, but well worthwhile for the pure brilliance and modernity of it.
Dell M1330 (US site).