I'm a little surprised that David didn't consider the G1 or GH1 - if you're going to take a tripod, and looking for the best possible IQ out of the camera for landscapes... these bodies are more suited to tripod use (articulating LCD is invaluable for composing on a tripod) and take a 4/3rds adapter + ZD 11-22 and you've got a killer landscape cam.
The GH1 will give arguably more dynamic range at base ISO, and the G1 is damned good value right now (since it's been discontinued)
Phil, the ZD 9-18mm f4-5.6 could be an even better choice for the G1 - it will support CDAF and is lighter + wider... but I have a soft spot for the ZD 11-22mm f2.8-3.5
E-3 + ZD 11-22
1/3s f/6.3 at 11.0mm iso100