On my 70IT the landscape is the default screen orientation when autorotation is off. Is there any apps or tweaks that can change the orientation to portrait without autorotation?
I use LauncherPro as my homescreen (faster & more flexible) and it has an orientation lock setting. I can't tell you about the stock home screen since I'm waiting for Archos to send me my replacement A70...
Only launcher that will remain locked in Portrait mode for me has been Go Launcher. Launcher Pro, ADW.Launcher, and Zeam seem to lock landscape wise, even if you say portrait.