We've just tested the Intempo RD1, which is an iPod dock with built-in DAB (£130). It's a smart-looking item, but we were disappointed with the sound which is harsh and lightweight, and it struggles to pick up some DAB stations.
A better bet is the Pure Chronos iDock (£100) that we recently tested in the Jan 08 issue of WHF?SV (5 stars). The DAB radio is composed, dynamic and commendably natural. Outright volume isn't all that impressive, but all iPods are catered for apart from the Shuffle.
If you want to spend less, look at Tesco's Technika DAB407 (£70). It's properly made from decent materials, and it sounds composed, too. DAB reception is solid, if a little unspectacular.