Could a duskblade with vampiric touch as his first third level spell take the reserve feat sickening grasp, full round attack with his two handed weapon, then take a hand off and touch attack with sickening grasp? The reserve feat states it is a touch attack, not a standard action, so I believe this should work as a nice debuff for two or three rounds using your lower base attack shot.
Complete Mage states:
Each reserve feat's primary benefit is a supernatural ability usable at will. Unless stated otherwise, it requires a standard action to activate and does not provoke attacks of opportunity.
The touch attack is merely a part of using the feat. Similar to Inflict Light Wounds allowing you to cast the spell, and then make a touch attack - as a part of the spell. Activating the feat itself, as a supernatural ability, is a standard action, giving you a touch attack as part of that standard action.