The problem with this debate on either side is that most of the time a speciation event cannot be isolated to a specific individual or time. Say that you have a group of species A1 that somehow got isolated from the main body of its population. Through time and lots of little changes in its gene pool, we can adequately call this group A2. But when do we decide that A2 is a different species than A1? To try to answer this question is like try to pin point the exact year the Bronze Age ended and the Iron Age began.
The
'few' instances that we have observed speciation taking place (the examples that people have pointed/linked to in this thread) are simply minute changes that the typical creationist can simply dismiss due to the apparent similarities still exist between the daughter and mother populations. And in many of these cases, gene flow are likely to reoccur.
Frankly, I find this part of the EvC debate quite redundant and boring. What we have here is disagreement of what defines as a species or "kind" rather than if speciation CAN occur or not. If you don't believe me, just give these examples to your creationist friend and see what happens.
The only way you can put this argument to rest is if you can point out a horse growing a pair of wings and turn into a pegasus or a cat giving birth to a monkey because that is how creationists define as speciation.