The "Hovercard" gimmick's DVD comes with a really, stunningly simple way to force a card, no sleight of hand required. (BTW, Hovercard paired with Rising Card makes a decent combination. Now I just need to get one of those "flying cards" in the same value/suit and I've got a three-trick routine that follows a single theme and ratchets it up a notch each stunt!)
That "40 Ways to Force a Card" DVD is good, I like it. Also enjoyed "Basic Card Techniques" DVD - covers more than forces, but it's good sampler of some ground-level card moves.