Hernan Ochoa from Core has released the Pass the Hash Toolkit which is very cool.. It basically means that you dont have to bother cracking a password on a taken machine anymore, you can simply use his iam.exe to associate the captured hash with your current session.. Its accompanying whoisthere.exe means you can grab hashes easily and the fact that its all released with source means you should be able to use it on a customer network without a sinking feeling in your stomach :>

If nothing else, it prevents you from having to resort to things like this and this..