I'd say no on tripping, just a normal weapon attack.
I will admit I'm a bit hesitant on my Yes (I know I gave it, but it was begrugingly). The Duskblade, the more I look at it, is high on the power scale. Realy, I think it'd be perfect if it was not full BAB, like the Psy-War, and full BAB and high spell counts make it abusive with the Arcane Strike feat.
In fact, I'm going to take back my yes for the moment and consider it more. I'd like some more discussion on it. RA seems conflicted as well, and I'd like some more examples of why.