I have enjoyed products in the Second Rat Games line before, most notably the excellent Background Noise. However, 100 Deathtraps is a bit of a disappointment.
The product features a d100 chart, and 100 individual traps or situations which could lead to a character's demise. There are no real mechanics to speak of, and some of the deathtraps are not "traps" in the sense one would perhaps initially consider (For example, leaving someone in the middle of the desert to die is one of the presented scenarios).
Ultimately, there's nothing here that couldn't be harvested from a bit of time on a site such as TV Tropes. This would be a good free or 50 cent supplement to get a Game Master's mind going, but is of regrettably only marginal utility at the current $1.99 price.
I can wholeheartedly recommend checking out some of the company's other titles, but this one probably rates a pass, unless a GM is just really stumped for precarious player situations.