I (have to) use Windows Vista for my development efforts. When working with Java, Groovy or Grails I spent a lot of my time at the command prompt. I couple of years back I purchased 4NT from JPSoft. This was a good move, because my command prompt productivity increased by 1000%. 4NT contained a lot of useful extra commands and environment variables.
But now JPSoft has released a free version of their command processor: Take Command Console LE. Really a must have if you are using Windows and spent your time at the command prompt. Together with Console2 I have a winning combination.