There's the PsiXPDA http://psixpda.com/content/psixpda-pocket-computer

Which is a 5" touchscreen device, with similar design to an N97, but obviously a bit larger. 16GB of storage internally + a microSD slot and it retails for £449 (UK) including XP.

It's atom based so should run linux. They are willing to sell it without Windows though, so it would be interesting to see what it came down to.

Other than that I don't know of anything closer than the N900. the Dell streak, and the archos units are interesting, but do not have physical keyboards, and I miss the keyboard even when I use ny N800!