What to do when a stock you own is bought out in cash by another company?

This is happening to me, with one of my stocks right now: RCRC.
A few months ago, I bought about 50 shares of RC2 Corporation (RCRC), a maker of die-cast  and wooden toys, at $20. My wife and I were looking for an investment idea based on the toys and media we’re buying for our 2-year-old son. What I’d really like to do is own Thomas the Tank Engine, but the company owning the license (HIT Entertainment) is privately owned. The best we can do is to buy the companies with contracts on …