Well, not really, but this link from Stefano Demiliani's blog seems like a great option.  Learning java has been something on my list for a while, but also not something that I could realisticly include in my development environment (at least until my next laptop, maybe with 2 gigs of ram).  This option, though, seems ideal if you want to learn java and some other non .net languages, without impacting any of your current environment setup.  Sweet.