Just got my LX-3 not too long back, and I really like the dynamic B&W setting. quite suitable for street shots, but sometimes it is a little to harsh for me, and then i'll knock down the 'contrast' setting by one.
i've been trying the scene modes, but so far havent been too impressed. Id love if they have a scene modes that mimics those cross-processed/lomo kinda shots. I know there's a pinhole effect, but i dont quite like it.
For daytime landscape and architectual I like to use High Dynamic - Art scene mode. The colours may look a bit fake but looks more striking than normal colours. Just personal preference