I thought there was actually a thread dedicated to speciation events, but I searched and didn't find one. I did come across a thread relevant to what's being discussed here though -
MACROevolution vs MICROevolution - what is it?
I know in one thread or another I've provided some examples of speciation events before, and now I'll just provide some links that list some speciation events.
Observed Instances of SpeciationThe above link discusses relevant issues to the discussion including species definitions, and starts listing events at section 5.0 Observed Instances of Speciation. Whether or not they all, if any, are deemed acceptable to all I cannot say.
Some More Observed Speciation Events This is a different page from the same website as the previous link listing more speciation events.
Oh, hey... I just found a thread on EvC about speciation events... through Google -
Speciation events
I'd swear that one didn't come up for some reason when I did a search on here.