[DouglasKC]

Given the absurd number of times bacteria have reproduced in the last 100+ years that we've been observing them (millions given the rapid rate of reproduction), how many new bacterial species have been seen? Any?

Same thing with fruitflies. You would think by now somebody would have observed fruit flies evolving into something other than a fly like creature.

In a lab you could even alter the environement and make it favorable to fruitflies who evolve fins and swim underwater. When a fruit fly turns into a new fish species...viola! I won't hold my breath though...

[Rammer]

You would think a single mutation is all it would take. Just one.

[JeffAtlanta]

When a fruit fly turns into a new fish species...viola! I won't hold my breath though...

I wouldn't hold my breath either since evolution doesn't work that way.