Automotive tool dealerships often carry a purpose-made "spade connector" crimping tool (often packaged with a bajillion different spade connectors to try it out on).

But like Omnikrys says, the "crocodile jaw" wire stripper can be used to do the job quite nicely.

The only difference between my crimper and my wire stripper is that the wire stripper works like a pair of pliers with the handles on the opposite side of the pivot to the jaws o' crimping, whereas the crimper has longer handles and the crimping jaw is on the handle side of the pivot, making for less precision but more brute force.

Tomayto/tomahto.

The wire stripper I have has the spots to crimp on it too and it was one of those cheap kit ones. Doesn't strip wire all that well but crimps disconnects like a champ. :p