I don't know where you're located alsnavely, but here in the midatlantic/south east/mainland NY I've been using aggressive native volunteer plants to help me fight the fight.
don't know if this'll work for you because virginia creeper is one of the plants I encourage. :) also (native volunteers): Impatiens capensis (jewelweed), circaea (enchanters nightshade), Viola sororia aka Viola papilionacea (common blue violet), Polygonum virginianum (virginia knotweed), Geum canadense (White Avens), Fragaria virginiana (wild strawberry), Polygonatum commutatum (solomons seal), Eurybia divaricata aka Aster divaricatus (white wood aster) to name a few. I've encouraged these because the price was right, these are easy to pull up (or xplant elsewhere) if you have something more desirable to plant in it's place, and they benefit wildlife. I've also planted asarum canadense (wild ginger), Eupatorium purpureum (joe pye weed), Asclepias incarnata (swamp milkweed), and Geranium maculatum (wild geranium). the fact that these plants are aggressive (some consider weedy) is what makes 'em prime candidates for this situation. If you have an area that you can spend more time with, and be even more diligent - maybe an area closer to the house, then I think something a bit less assertive might work. good luck to you - and keep pullin' out those nasties | 
