Yes. Evolution is just change in phenotypes over time. Speciation is a whole other ballgame, and there's no definitive answer as to what delineates species from one another. Some different species of fish will interbreed when forced together.
That is: Species are not well defined. They are only defined for human convenience, for categorization. But in reality, it's all one continuum. Interbreeding is only one factor in categorizing it. The big thing about being able to interbreed is chromosonal alignment, not necessarily whether they are differing species.
The humans of today aren't the same as the humans from 500 or 1,000 years ago. Prevalence of sickle-cell disease, lactose intolerance, skin pigmentation all these little things add up. If your substantiation of evolution consists of when speciation occurs, you're limiting yourself.
Take dog breeds for example. The changes we've implemented using the tool of evolution are drastic. What's to prevent this process from continuing? From eventually causing 'speciation', in the sense that two dog breeds can no longer interbreed? There are already subtle differences between dog breeds that make producing offspring difficult, and in the wild this difference would be magnified greatly.