The "Five Cubes" Puzzle Question

In April I posed the puzzle question: "How many unique* structures is it possible to construct by connecting five identical cubes together?" (Each connection between cubes must be "full-face to full-face" - no "bricklayer staggering" allowed.)

*(A structure is considered to be unique if it cannot
be rotated into an orientataion that exactly matches
any of the previously generated structures.)

The "official" answer to the puzzle currently stands at 29. (To view the 29 configurations, click here.) However, we will pay $20 in cash to the first person who can either:

  1. find a configuration that is missing from the 29 that are given, or
  2. show that two of the posted configurations are actually the same.

Update: [2002 May 23] Gene #317 and I have each independently written separate computer programs to solve for the number of unique configurations, and we both verified that 29 is indeed the correct answer. Furthermore, we both found that the number of unique configurations that can be made with six cubes is 166. With seven cubes, my program found 1023 unique configurations in about 8 minutes.