Specs? Without details price is meaningless.
The Kirkwood based iomega iconnect for example.
The great thing about ARM platforms is not processing power, but energy efficiency. I also don't like fans on my CPUs.
Better devices will come, and for more competition I hope MIPS manages to get into this segment again. We've been seeing their chips for a long time, most recently embedded in consumer products like dsl routers.
An other point: I also like having one device just for one thing. Don't put CPUs in your computer, instead buy more computers.
On the other hand I'm writing this on an old thinkpad x60s (core duo) without a fan (disabled) which suits me all right. Current figures after 1 hour of web browsing: P=11W, T=49C
And I have two old celerons which are still working. One embedded t-online s100 settop box and a normal fanless tower.
Sometimes it's not the CPU, but peripherals which eat the most, but ARM nonetheless pushes the bar one dimension lower (or was it higher?