Even though I disagree with Werk, just to play devils advocate what would the price difference be on a suit of Mith Full plate + 1 VS a Breast Plate +4.
That's where you're getting something for nothing.
Just want to point something out here. The above example is wrong because when you use arcane channelling the effect only lasts one round, so you wouldn't be able to attack with chill touch more than once.
I think one point that seems to be overlooked is that the spell isn't really being cast. I don't have the text in front of me but I believe the wording is similar to what Nonlethal Force mentions above. The Duskblade can deliver any touch spell through a weapon attack, it doesn't implicit say...
How do you guys think the two would mix?
The biggest limitation to the Spirit Shaman is his small spells known per day, but with these feats you'd be pretty much boosting it from 3 to 5.