Wobble - the "sudden explosion" of life in the Cambrian actually took place over 50 million years or so. And we're not talking about complex life forms in today's terms. One of the reasons that so few precambrian fossils exist is because most precambrian life was soft-bodied, which does not fossilize well.
Cantleave - the probability arguments become far less daunting when considering the fact that millions upon millions of reactions, combinations, and pairings were happening at the same time. Flipping a coin and getting heads a thousand times in a row is highly improbable. Flipping a million coins concurrently over millions of years, once every few seconds, drastically increases those odds.
Edit: one resource that I find immensely helpful is the Talkorigins Archive. Especially interesting is the index of creationist claims. A really nice resource for early and surprising fossils is Stephen Jay Gould's Wonderful Life.