I try to use a vise where possible, but when the stock is too big for that, I generally use one of the clamping kits that just about any tool supply house sells. In those cases I'll either clamp the stock directly to the table or with the stock sitting on 2 or more 1-2-3 blocks if the work will be milled or drilled all the way through and there is a chance that the cutter could hit the top of the table. A tooling plate can also be handy for repeating jobs.
Mike