A547 Yes (probably).
The description of the Duskblade ability "Arcane Channeling" includes the statement "and deliver the spell through the weapon with a melee attack". Trip attacks are melee attacks so this should work fine.
Caveat: your DM may disagree and its his (or her) call. Also it goes on to state "if the melee attack is successful, the attack deals damage normally" and it could be argued that since a trip attack does not deal damage it cannot be a trip attack. Personally I would disagree with this ruling as poor use of English grammar (I would say that normal damage for a trip attack is the trip check) but for completeness I have to point it out.